21465224055 has 48 divisors (see below), whose sum is σ = 40948086816. Its totient is φ = 10315253760.

The previous prime is 21465224023. The next prime is 21465224069. The reversal of 21465224055 is 55042256412.

21465224055 = 19911² + 19912² + ... + 19964².

21465224055 is a `hidden beast` number, since 2 + 1 + 46 + 522 + 40 + 55 = 666.

It is not a de Polignac number, because 21465224055 - 2⁵ = 21465224023 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135942 + ... + 247811.

It is an arithmetic number, because the mean of its divisors is an integer number (853085142).

Almost surely, 2^21465224055 is an apocalyptic number.

21465224055 is a deficient number, since it is larger than the sum of its proper divisors (19482862761).

21465224055 is a wasteful number, since it uses less digits than its factorization.

21465224055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383888 (or 383885 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

The spelling of 21465224055 in words is "twenty-one billion, four hundred sixty-five million, two hundred twenty-four thousand, fifty-five".