21084408108 has 48 divisors (see below), whose sum is σ = 57039951360. Its totient is φ = 6722564112.

The previous prime is 21084408017. The next prime is 21084408119. The reversal of 21084408108 is 80180448012.

It is a happy number.

21084408108 is a `hidden beast` number, since 2 + 108 + 440 + 8 + 108 = 666.

It is a super-2 number, since 2×21084408108² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4241560 + ... + 4246527.

It is an arithmetic number, because the mean of its divisors is an integer number (1188332320).

Almost surely, 2^21084408108 is an apocalyptic number.

It is an amenable number.

21084408108 is an abundant number, since it is smaller than the sum of its proper divisors (35955543252).

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

21084408108 is a wasteful number, since it uses less digits than its factorization.

21084408108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8488123 (or 8488115 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The spelling of 21084408108 in words is "twenty-one billion, eighty-four million, four hundred eight thousand, one hundred eight".