133021021 has 4 divisors (see below), whose sum is σ = 152024032. Its totient is φ = 114018012.

The previous prime is 133021013. The next prime is 133021027. The reversal of 133021021 is 120120331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120120331 = 293 ⋅409967.

It is a cyclic number.

It is not a de Polignac number, because 133021021 - 2³ = 133021013 is a prime.

It is a Duffinian number.

133021021 is a modest number, since divided by 21021 gives 133 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 133020992 and 133021010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133021027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9501495 + ... + 9501508.

It is an arithmetic number, because the mean of its divisors is an integer number (38006008).

Almost surely, 2^133021021 is an apocalyptic number.

It is an amenable number.

133021021 is a deficient number, since it is larger than the sum of its proper divisors (19003011).

133021021 is an equidigital number, since it uses as much as digits as its factorization.

133021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19003010.

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

The square root of 133021021 is about 11533.4739345958. The cubic root of 133021021 is about 510.4737632739.

Adding to 133021021 its reverse (120120331), we get a palindrome (253141352).

The spelling of 133021021 in words is "one hundred thirty-three million, twenty-one thousand, twenty-one".