21502340051200 has 108 divisors (see below), whose sum is σ = 53225109695268. Its totient is φ = 8600377139200.

The previous prime is 21502340051197. The next prime is 21502340051249. The reversal of 21502340051200 is 215004320512.

It can be written as a sum of positive squares in 6 ways, for example, as 5410945908736 + 16091394142464 = 2326144^2 + 4011408^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106529574 + ... + 106731226.

It is an arithmetic number, because the mean of its divisors is an integer number (492825089771).

Almost surely, 2^{21502340051200} is an apocalyptic number.

21502340051200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21502340051200 is an abundant number, since it is smaller than the sum of its proper divisors (31722769644068).

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

21502340051200 is a wasteful number, since it uses less digits than its factorization.

21502340051200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218340 (or 218321 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21502340051200 its reverse (215004320512), we get a palindrome (21717344371712).

The spelling of 21502340051200 in words is "twenty-one trillion, five hundred two billion, three hundred forty million, fifty-one thousand, two hundred".