21245031553152 has 64 divisors (see below), whose sum is σ = 61562307353760. Its totient is φ = 6437888348160.

The previous prime is 21245031553117. The next prime is 21245031553181. The reversal of 21245031553152 is 25135513054212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21245031553152² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21245031553152.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2514795913 + ... + 2514804360.

Almost surely, 2^{21245031553152} is an apocalyptic number.

21245031553152 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21245031553152 is an abundant number, since it is smaller than the sum of its proper divisors (40317275800608).

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

21245031553152 is a wasteful number, since it uses less digits than its factorization.

21245031553152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5029600301 (or 5029600289 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 21245031553152 in words is "twenty-one trillion, two hundred forty-five billion, thirty-one million, five hundred fifty-three thousand, one hundred fifty-two".