21242502115252 has 96 divisors (see below), whose sum is σ = 43089638207616. Its totient is φ = 9055958630400.

The previous prime is 21242502115243. The next prime is 21242502115277. The reversal of 21242502115252 is 25251120524212.

It is a super-2 number, since 2×21242502115252² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 246398218 + ... + 246484414.

It is an arithmetic number, because the mean of its divisors is an integer number (448850397996).

Almost surely, 2^{21242502115252} is an apocalyptic number.

21242502115252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21242502115252 is an abundant number, since it is smaller than the sum of its proper divisors (21847136092364).

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

21242502115252 is a wasteful number, since it uses less digits than its factorization.

21242502115252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87377 (or 87375 counting only the distinct ones).

The product of its (nonzero) digits is 32000, while the sum is 34.

Adding to 21242502115252 its reverse (25251120524212), we get a palindrome (46493622639464).

The spelling of 21242502115252 in words is "twenty-one trillion, two hundred forty-two billion, five hundred two million, one hundred fifteen thousand, two hundred fifty-two".