21343180872 has 64 divisors (see below), whose sum is σ = 57476381760. Its totient is φ = 6565536000.

The previous prime is 21343180861. The next prime is 21343180883. The reversal of 21343180872 is 27808134312.

It is an interprime number because it is at equal distance from previous prime (21343180861) and next prime (21343180883).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 21343180872.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320122 + ... + 2329302.

It is an arithmetic number, because the mean of its divisors is an integer number (898068465).

Almost surely, 2^21343180872 is an apocalyptic number.

It is an amenable number.

21343180872 is an abundant number, since it is smaller than the sum of its proper divisors (36133200888).

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

21343180872 is a wasteful number, since it uses less digits than its factorization.

21343180872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16654 (or 16650 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 39.

The spelling of 21343180872 in words is "twenty-one billion, three hundred forty-three million, one hundred eighty thousand, eight hundred seventy-two".