21115502463204 has 18 divisors (see below), whose sum is σ = 53375297893190. Its totient is φ = 7038500821056.

The previous prime is 21115502463089. The next prime is 21115502463227. The reversal of 21115502463204 is 40236420551112.

21115502463204 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 550 + 24 + 63 + 20 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12599319400704 + 8516183062500 = 3549552^2 + 2918250^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 586541735089 = 21115502463204 / (2 + 1 + 1 + 1 + 5 + 5 + 0 + 2 + 4 + 6 + 3 + 2 + 0 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293270867509 + ... + 293270867580.

Almost surely, 2^{21115502463204} is an apocalyptic number.

It is an amenable number.

21115502463204 is an abundant number, since it is smaller than the sum of its proper divisors (32259795429986).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115502463204 is a wasteful number, since it uses less digits than its factorization.

21115502463204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586541735099 (or 586541735094 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

It can be divided in two parts, 2111550 and 2463204, that added together give a palindrome (4574754).

The spelling of 21115502463204 in words is "twenty-one trillion, one hundred fifteen billion, five hundred two million, four hundred sixty-three thousand, two hundred four".