21222562501 has 16 divisors (see below), whose sum is σ = 25119313920. Its totient is φ = 17552954160.

The previous prime is 21222562477. The next prime is 21222562511. The reversal of 21222562501 is 10526522212.

It is not a de Polignac number, because 21222562501 - 2⁵ = 21222562469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222562501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222562511) 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 15 ways as a sum of consecutive naturals, for example, 430911 + ... + 477628.

It is an arithmetic number, because the mean of its divisors is an integer number (1569957120).

Almost surely, 2^21222562501 is an apocalyptic number.

It is an amenable number.

21222562501 is a deficient number, since it is larger than the sum of its proper divisors (3896751419).

21222562501 is an equidigital number, since it uses as much as digits as its factorization.

21222562501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 908664.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21222562501 in words is "twenty-one billion, two hundred twenty-two million, five hundred sixty-two thousand, five hundred one".