133100021 has 8 divisors (see below), whose sum is σ = 141960600. Its totient is φ = 124354048.

The previous prime is 133100017. The next prime is 133100039. The reversal of 133100021 is 120001331.

It can be written as a sum of positive squares in 4 ways, for example, as 9579025 + 123520996 = 3095^2 + 11114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 133100021 - 2² = 133100017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133099975 and 133100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133100041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26246 + ... + 30903.

It is an arithmetic number, because the mean of its divisors is an integer number (17745075).

Almost surely, 2^133100021 is an apocalyptic number.

It is an amenable number.

133100021 is a deficient number, since it is larger than the sum of its proper divisors (8860579).

133100021 is a wasteful number, since it uses less digits than its factorization.

133100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57303.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 133100021 is about 11536.8982399950. The cubic root of 133100021 is about 510.5747985496.

Adding to 133100021 its reverse (120001331), we get a palindrome (253101352).

The spelling of 133100021 in words is "one hundred thirty-three million, one hundred thousand, twenty-one".