21902055405240 has 32 divisors (see below), whose sum is σ = 65706166216080. Its totient is φ = 5840548108032.

The previous prime is 21902055405239. The next prime is 21902055405281. The reversal of 21902055405240 is 4250455020912.

It is a congruent number.

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, 91258564069 + ... + 91258564308.

Almost surely, 2^{21902055405240} is an apocalyptic number.

21902055405240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21902055405240 is an abundant number, since it is smaller than the sum of its proper divisors (43804110810840).

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

21902055405240 is a wasteful number, since it uses less digits than its factorization.

21902055405240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182517128391 (or 182517128387 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 39.

The spelling of 21902055405240 in words is "twenty-one trillion, nine hundred two billion, fifty-five million, four hundred five thousand, two hundred forty".