21479104788 has 24 divisors (see below), whose sum is σ = 51734618880. Its totient is φ = 6928743360.

The previous prime is 21479104753. The next prime is 21479104793. The reversal of 21479104788 is 88740197412.

It is a super-2 number, since 2×21479104788² (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 21479104788.

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, 28869393 + ... + 28870136.

It is an arithmetic number, because the mean of its divisors is an integer number (2155609120).

Almost surely, 2^21479104788 is an apocalyptic number.

It is an amenable number.

21479104788 is an abundant number, since it is smaller than the sum of its proper divisors (30255514092).

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

21479104788 is a wasteful number, since it uses less digits than its factorization.

21479104788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57739567 (or 57739565 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 21479104788 in words is "twenty-one billion, four hundred seventy-nine million, one hundred four thousand, seven hundred eighty-eight".