21255525503412 has 48 divisors (see below), whose sum is σ = 49827428230272. Its totient is φ = 7052188631040.

The previous prime is 21255525503309. The next prime is 21255525503461. The reversal of 21255525503412 is 21430552555212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1373712 + ... + 6663192.

It is an arithmetic number, because the mean of its divisors is an integer number (1038071421464).

Almost surely, 2^{21255525503412} is an apocalyptic number.

It is an amenable number.

21255525503412 is an abundant number, since it is smaller than the sum of its proper divisors (28571902726860).

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

21255525503412 is a wasteful number, since it uses less digits than its factorization.

21255525503412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5291048 (or 5291046 counting only the distinct ones).

The product of its (nonzero) digits is 600000, while the sum is 42.

The spelling of 21255525503412 in words is "twenty-one trillion, two hundred fifty-five billion, five hundred twenty-five million, five hundred three thousand, four hundred twelve".