23203000021521 has 32 divisors (see below), whose sum is σ = 31143876820992. Its totient is φ = 15365805940160.

The previous prime is 23203000021483. The next prime is 23203000021543. The reversal of 23203000021521 is 12512000030232.

It is a cyclic number.

It is not a de Polignac number, because 23203000021521 - 2⁶ = 23203000021457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23203000001521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 436999051 + ... + 437052143.

It is an arithmetic number, because the mean of its divisors is an integer number (973246150656).

Almost surely, 2^{23203000021521} is an apocalyptic number.

It is an amenable number.

23203000021521 is a deficient number, since it is larger than the sum of its proper divisors (7940876799471).

23203000021521 is a wasteful number, since it uses less digits than its factorization.

23203000021521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55013.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 23203000021521 its reverse (12512000030232), we get a palindrome (35715000051753).

The spelling of 23203000021521 in words is "twenty-three trillion, two hundred three billion, twenty-one thousand, five hundred twenty-one".