21108047592 has 32 divisors (see below), whose sum is σ = 52791055200. Its totient is φ = 7033224384.

The previous prime is 21108047581. The next prime is 21108047593. The reversal of 21108047592 is 29574080112.

It is a super-2 number, since 2×21108047592² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21108047592.

It is not an unprimeable number, because it can be changed into a prime (21108047593) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112263 + ... + 234134.

It is an arithmetic number, because the mean of its divisors is an integer number (1649720475).

Almost surely, 2^21108047592 is an apocalyptic number.

It is an amenable number.

21108047592 is an abundant number, since it is smaller than the sum of its proper divisors (31683007608).

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

21108047592 is a wasteful number, since it uses less digits than its factorization.

21108047592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348945 (or 348941 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 39.

The spelling of 21108047592 in words is "twenty-one billion, one hundred eight million, forty-seven thousand, five hundred ninety-two".