133102021 has 4 divisors (see below), whose sum is σ = 143340652. Its totient is φ = 122863392.

The previous prime is 133102019. The next prime is 133102043. The reversal of 133102021 is 120201331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120201331 = 613 ⋅196087.

It can be written as a sum of positive squares in 2 ways, for example, as 17969121 + 115132900 = 4239^2 + 10730^2 .

It is a cyclic number.

It is not a de Polignac number, because 133102021 - 2¹ = 133102019 is a prime.

It is a super-2 number, since 2×133102021² = 35432295988568882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 10238617 = 133102021 / (1 + 3 + 3 + 1 + 0 + 2 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 133101992 and 133102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133102001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5119296 + ... + 5119321.

It is an arithmetic number, because the mean of its divisors is an integer number (35835163).

Almost surely, 2^133102021 is an apocalyptic number.

It is an amenable number.

133102021 is a deficient number, since it is larger than the sum of its proper divisors (10238631).

133102021 is a wasteful number, since it uses less digits than its factorization.

133102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10238630.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 133102021 is about 11536.9849180798. The cubic root of 133102021 is about 510.5773558857.

Adding to 133102021 its reverse (120201331), we get a palindrome (253303352).

The spelling of 133102021 in words is "one hundred thirty-three million, one hundred two thousand, twenty-one".