21121504552232 has 128 divisors (see below), whose sum is σ = 47823367987200. Its totient is φ = 8543106816768.

The previous prime is 21121504552231. The next prime is 21121504552259. The reversal of 21121504552232 is 23225540512112.

It is a super-2 number, since 2×21121504552232² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21121504552192 and 21121504552201.

It is not an unprimeable number, because it can be changed into a prime (21121504552231) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 1628106098 + ... + 1628119070.

It is an arithmetic number, because the mean of its divisors is an integer number (373620062400).

Almost surely, 2^{21121504552232} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21121504552232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23911683993600).

21121504552232 is an abundant number, since it is smaller than the sum of its proper divisors (26701863434968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21121504552232 is a wasteful number, since it uses less digits than its factorization.

21121504552232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18695 (or 18691 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 35.

The spelling of 21121504552232 in words is "twenty-one trillion, one hundred twenty-one billion, five hundred four million, five hundred fifty-two thousand, two hundred thirty-two".