21646207295340 has 24 divisors (see below), whose sum is σ = 60609380427120. Its totient is φ = 5772321945408.

The previous prime is 21646207295327. The next prime is 21646207295417. The reversal of 21646207295340 is 4359270264612.

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, 180385060735 + ... + 180385060854.

It is an arithmetic number, because the mean of its divisors is an integer number (2525390851130).

Almost surely, 2^{21646207295340} is an apocalyptic number.

21646207295340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21646207295340 is an abundant number, since it is smaller than the sum of its proper divisors (38963173131780).

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

21646207295340 is a wasteful number, since it uses less digits than its factorization.

21646207295340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360770121601 (or 360770121599 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 51.

The spelling of 21646207295340 in words is "twenty-one trillion, six hundred forty-six billion, two hundred seven million, two hundred ninety-five thousand, three hundred forty".