21426563055 has 32 divisors (see below), whose sum is σ = 36204537600. Its totient is φ = 10790744832.

The previous prime is 21426563051. The next prime is 21426563069. The reversal of 21426563055 is 55036562412.

It is not a de Polignac number, because 21426563055 - 2² = 21426563051 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21426563051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34950 + ... + 209939.

It is an arithmetic number, because the mean of its divisors is an integer number (1131391800).

Almost surely, 2^21426563055 is an apocalyptic number.

21426563055 is a deficient number, since it is larger than the sum of its proper divisors (14777974545).

21426563055 is a wasteful number, since it uses less digits than its factorization.

21426563055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245223.

The product of its (nonzero) digits is 216000, while the sum is 39.

The spelling of 21426563055 in words is "twenty-one billion, four hundred twenty-six million, five hundred sixty-three thousand, fifty-five".