123133521 has 24 divisors (see below), whose sum is σ = 196152960. Its totient is φ = 68457312.

The previous prime is 123133511. The next prime is 123133541. The reversal of 123133521 is 125331321.

It is not a de Polignac number, because 123133521 - 2⁷ = 123133393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (123133511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5881 + ... + 16758.

It is an arithmetic number, because the mean of its divisors is an integer number (8173040).

Almost surely, 2^123133521 is an apocalyptic number.

It is an amenable number.

123133521 is a deficient number, since it is larger than the sum of its proper divisors (73019439).

123133521 is a wasteful number, since it uses less digits than its factorization.

123133521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22693 (or 22686 counting only the distinct ones).

The product of its digits is 540, while the sum is 21.

The square root of 123133521 is about 11096.5544652383. The cubic root of 123133521 is about 497.4988709014.

Adding to 123133521 its reverse (125331321), we get a palindrome (248464842).

The spelling of 123133521 in words is "one hundred twenty-three million, one hundred thirty-three thousand, five hundred twenty-one".