21490995848784 has 240 divisors, whose sum is σ = 71418910772160. Its totient is φ = 5505609553920.

The previous prime is 21490995848771. The next prime is 21490995848801. The reversal of 21490995848784 is 48784859909412.

It is a super-2 number, since 2×21490995848784² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3800839 + ... + 7578150.

It is an arithmetic number, because the mean of its divisors is an integer number (297578794884).

Almost surely, 2^{21490995848784} is an apocalyptic number.

21490995848784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21490995848784 is an abundant number, since it is smaller than the sum of its proper divisors (49927914923376).

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

21490995848784 is a wasteful number, since it uses less digits than its factorization.

21490995848784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11379098 (or 11379085 counting only the distinct ones).

The product of its (nonzero) digits is 1672151040, while the sum is 78.

The spelling of 21490995848784 in words is "twenty-one trillion, four hundred ninety billion, nine hundred ninety-five million, eight hundred forty-eight thousand, seven hundred eighty-four".