21652405602220 has 24 divisors (see below), whose sum is σ = 45481259736864. Its totient is φ = 8658827389056.

The previous prime is 21652405602181. The next prime is 21652405602299. The reversal of 21652405602220 is 2220650425612.

It is a self number, because there is not a number n which added to its sum of digits gives 21652405602220.

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, 133345072 + ... + 133507351.

It is an arithmetic number, because the mean of its divisors is an integer number (1895052489036).

Almost surely, 2^{21652405602220} is an apocalyptic number.

21652405602220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21652405602220 is an abundant number, since it is smaller than the sum of its proper divisors (23828854134644).

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

21652405602220 is a wasteful number, since it uses less digits than its factorization.

21652405602220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266856489 (or 266856487 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 21652405602220 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred five million, six hundred two thousand, two hundred twenty".