21115345364055 has 12 divisors (see below), whose sum is σ = 36599931964440. Its totient is φ = 11261517527472.

The previous prime is 21115345364053. The next prime is 21115345364131. The reversal of 21115345364055 is 55046354351112.

It is a happy number.

21115345364055 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 534 + 5 + 3 + 64 + 0 + 55 = 666.

It is not a de Polignac number, because 21115345364055 - 2¹ = 21115345364053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 469229896979 = 21115345364055 / (2 + 1 + 1 + 1 + 5 + 3 + 4 + 5 + 3 + 6 + 4 + 0 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 21115345364055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115345364053) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 234614948445 + ... + 234614948534.

It is an arithmetic number, because the mean of its divisors is an integer number (3049994330370).

Almost surely, 2^{21115345364055} is an apocalyptic number.

21115345364055 is a deficient number, since it is larger than the sum of its proper divisors (15484586600385).

21115345364055 is a wasteful number, since it uses less digits than its factorization.

21115345364055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469229896990 (or 469229896987 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 21115345364055 in words is "twenty-one trillion, one hundred fifteen billion, three hundred forty-five million, three hundred sixty-four thousand, fifty-five".