220215561021 has 24 divisors (see below), whose sum is σ = 319052784960. Its totient is φ = 146365819776.

The previous prime is 220215561011. The next prime is 220215561029. The reversal of 220215561021 is 120165512022.

220215561021 is a `hidden beast` number, since 2 + 2 + 0 + 2 + 1 + 556 + 102 + 1 = 666.

It is not a de Polignac number, because 220215561021 - 2²² = 220211366717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220215561029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24347526 + ... + 24356568.

It is an arithmetic number, because the mean of its divisors is an integer number (13293866040).

Almost surely, 2^220215561021 is an apocalyptic number.

It is an amenable number.

220215561021 is a deficient number, since it is larger than the sum of its proper divisors (98837223939).

220215561021 is a wasteful number, since it uses less digits than its factorization.

220215561021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16945 (or 16942 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The spelling of 220215561021 in words is "two hundred twenty billion, two hundred fifteen million, five hundred sixty-one thousand, twenty-one".