21130419872 has 48 divisors (see below), whose sum is σ = 43518724200. Its totient is φ = 10086236160.

The previous prime is 21130419833. The next prime is 21130419887. The reversal of 21130419872 is 27891403112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18497088016 + 2633331856 = 136004^2 + 51316^2 .

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, 45329 + ... + 210512.

Almost surely, 2^21130419872 is an apocalyptic number.

It is an amenable number.

21130419872 is an abundant number, since it is smaller than the sum of its proper divisors (22388304328).

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

21130419872 is a wasteful number, since it uses less digits than its factorization.

21130419872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255969 (or 255961 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 21130419872 in words is "twenty-one billion, one hundred thirty million, four hundred nineteen thousand, eight hundred seventy-two".