10220656621 has 12 divisors (see below), whose sum is σ = 11976126588. Its totient is φ = 8696611392.

The previous prime is 10220656583. The next prime is 10220656637. The reversal of 10220656621 is 12665602201.

It can be written as a sum of positive squares in 2 ways, for example, as 1841268100 + 8379388521 = 42910^2 + 91539^2 .

It is not a de Polignac number, because 10220656621 - 2⁹ = 10220656109 is a prime.

It is a super-2 number, since 2×10220656621² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10220656661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 754546 + ... + 767971.

It is an arithmetic number, because the mean of its divisors is an integer number (998010549).

Almost surely, 2^10220656621 is an apocalyptic number.

It is an amenable number.

10220656621 is a deficient number, since it is larger than the sum of its proper divisors (1755469967).

10220656621 is a wasteful number, since it uses less digits than its factorization.

10220656621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522668 (or 1522661 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The spelling of 10220656621 in words is "ten billion, two hundred twenty million, six hundred fifty-six thousand, six hundred twenty-one".