21956224353055 has 16 divisors (see below), whose sum is σ = 26681515297920. Its totient is φ = 17342290996992.

The previous prime is 21956224353043. The next prime is 21956224353071. The reversal of 21956224353055 is 55035342265912.

It is not a de Polignac number, because 21956224353055 - 2⁷ = 21956224352927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21956224352993 and 21956224353011.

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, 20190697 + ... + 21250333.

It is an arithmetic number, because the mean of its divisors is an integer number (1667594706120).

Almost surely, 2^{21956224353055} is an apocalyptic number.

21956224353055 is a deficient number, since it is larger than the sum of its proper divisors (4725290944865).

21956224353055 is a wasteful number, since it uses less digits than its factorization.

21956224353055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112178.

The product of its (nonzero) digits is 9720000, while the sum is 52.

The spelling of 21956224353055 in words is "twenty-one trillion, nine hundred fifty-six billion, two hundred twenty-four million, three hundred fifty-three thousand, fifty-five".