21415340888 has 16 divisors (see below), whose sum is σ = 41449047360. Its totient is φ = 10362261600.

The previous prime is 21415340831. The next prime is 21415340923. The reversal of 21415340888 is 88804351412.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43175843 + ... + 43176338.

It is an arithmetic number, because the mean of its divisors is an integer number (2590565460).

Almost surely, 2^21415340888 is an apocalyptic number.

It is an amenable number.

21415340888 is a deficient number, since it is larger than the sum of its proper divisors (20033706472).

21415340888 is a wasteful number, since it uses less digits than its factorization.

21415340888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86352218 (or 86352214 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 44.

The spelling of 21415340888 in words is "twenty-one billion, four hundred fifteen million, three hundred forty thousand, eight hundred eighty-eight".