21621533005252 has 48 divisors (see below), whose sum is σ = 38424468071808. Its totient is φ = 10644330101760.

The previous prime is 21621533005217. The next prime is 21621533005279. The reversal of 21621533005252 is 25250033512612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120310102 + ... + 120489682.

It is an arithmetic number, because the mean of its divisors is an integer number (800509751496).

Almost surely, 2^{21621533005252} is an apocalyptic number.

It is an amenable number.

21621533005252 is a deficient number, since it is larger than the sum of its proper divisors (16802935066556).

21621533005252 is a wasteful number, since it uses less digits than its factorization.

21621533005252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181276 (or 181274 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 37.

Adding to 21621533005252 its reverse (25250033512612), we get a palindrome (46871566517864).

The spelling of 21621533005252 in words is "twenty-one trillion, six hundred twenty-one billion, five hundred thirty-three million, five thousand, two hundred fifty-two".