10556501621 has 4 divisors (see below), whose sum is σ = 10658992032. Its totient is φ = 10454011212.

The previous prime is 10556501587. The next prime is 10556501629. The reversal of 10556501621 is 12610565501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10556501621 is a prime.

It is a super-2 number, since 2×10556501621² (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 (10556501629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51245051 + ... + 51245256.

It is an arithmetic number, because the mean of its divisors is an integer number (2664748008).

Almost surely, 2^10556501621 is an apocalyptic number.

It is an amenable number.

10556501621 is a deficient number, since it is larger than the sum of its proper divisors (102490411).

10556501621 is a wasteful number, since it uses less digits than its factorization.

10556501621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102490410.

The product of its (nonzero) digits is 9000, while the sum is 32.

The spelling of 10556501621 in words is "ten billion, five hundred fifty-six million, five hundred one thousand, six hundred twenty-one".