21860418402 has 32 divisors (see below), whose sum is σ = 50690828160. Its totient is φ = 6969988080.

The previous prime is 21860418401. The next prime is 21860418421. The reversal of 21860418402 is 20481406812.

21860418402 is a `hidden beast` number, since 2 + 1 + 8 + 604 + 1 + 8 + 40 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21860418401) 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, 8799249 + ... + 8801732.

It is an arithmetic number, because the mean of its divisors is an integer number (1584088380).

Almost surely, 2^21860418402 is an apocalyptic number.

21860418402 is an abundant number, since it is smaller than the sum of its proper divisors (28830409758).

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

21860418402 is a wasteful number, since it uses less digits than its factorization.

21860418402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17601015 (or 17601009 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The spelling of 21860418402 in words is "twenty-one billion, eight hundred sixty million, four hundred eighteen thousand, four hundred two".