21115574616 has 32 divisors (see below), whose sum is σ = 53083857600. Its totient is φ = 6999202080.

The previous prime is 21115574593. The next prime is 21115574629. The reversal of 21115574616 is 61647551112.

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, 2453290 + ... + 2461881.

It is an arithmetic number, because the mean of its divisors is an integer number (1658870550).

Almost surely, 2^21115574616 is an apocalyptic number.

It is an amenable number.

21115574616 is an abundant number, since it is smaller than the sum of its proper divisors (31968282984).

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

21115574616 is a wasteful number, since it uses less digits than its factorization.

21115574616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4915359 (or 4915355 counting only the distinct ones).

The product of its digits is 50400, while the sum is 39.

The spelling of 21115574616 in words is "twenty-one billion, one hundred fifteen million, five hundred seventy-four thousand, six hundred sixteen".