21221523640220 has 48 divisors (see below), whose sum is σ = 44769124770048. Its totient is φ = 8449773519360.

The previous prime is 21221523640139. The next prime is 21221523640231. The reversal of 21221523640220 is 2204632512212.

It is a super-2 number, since 2×21221523640220² (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 15 ways as a sum of consecutive naturals, for example, 50012792 + ... + 50435328.

It is an arithmetic number, because the mean of its divisors is an integer number (932690099376).

Almost surely, 2^{21221523640220} is an apocalyptic number.

21221523640220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21221523640220 is an abundant number, since it is smaller than the sum of its proper divisors (23547601129828).

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

21221523640220 is a wasteful number, since it uses less digits than its factorization.

21221523640220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434030 (or 434028 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

The spelling of 21221523640220 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred twenty-three million, six hundred forty thousand, two hundred twenty".