21655077150863 has 16 divisors (see below), whose sum is σ = 24550499729280. Its totient is φ = 18935509986144.

The previous prime is 21655077150827. The next prime is 21655077150877. The reversal of 21655077150863 is 36805177055612.

It is a cyclic number.

It is not a de Polignac number, because 21655077150863 - 2²⁴ = 21655060373647 is a prime.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21655077150799 and 21655077150808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655077150163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1266281 + ... + 6701762.

It is an arithmetic number, because the mean of its divisors is an integer number (1534406233080).

Almost surely, 2^{21655077150863} is an apocalyptic number.

21655077150863 is a deficient number, since it is larger than the sum of its proper divisors (2895422578417).

21655077150863 is a wasteful number, since it uses less digits than its factorization.

21655077150863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7979078.

The product of its (nonzero) digits is 10584000, while the sum is 56.

The spelling of 21655077150863 in words is "twenty-one trillion, six hundred fifty-five billion, seventy-seven million, one hundred fifty thousand, eight hundred sixty-three".