21130677208 has 32 divisors (see below), whose sum is σ = 42460011360. Its totient is φ = 9832838400.

The previous prime is 21130677199. The next prime is 21130677229. The reversal of 21130677208 is 80277603112.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1545093 + ... + 1558708.

It is an arithmetic number, because the mean of its divisors is an integer number (1326875355).

Almost surely, 2^21130677208 is an apocalyptic number.

It is an amenable number.

21130677208 is an abundant number, since it is smaller than the sum of its proper divisors (21329334152).

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

21130677208 is a wasteful number, since it uses less digits than its factorization.

21130677208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3103867 (or 3103863 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The spelling of 21130677208 in words is "twenty-one billion, one hundred thirty million, six hundred seventy-seven thousand, two hundred eight".