21347432156 has 24 divisors (see below), whose sum is σ = 38006040240. Its totient is φ = 10488705152.

The previous prime is 21347432147. The next prime is 21347432191. The reversal of 21347432156 is 65123474312.

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, 639086 + ... + 671658.

It is an arithmetic number, because the mean of its divisors is an integer number (1583585010).

Almost surely, 2^21347432156 is an apocalyptic number.

It is an amenable number.

21347432156 is a deficient number, since it is larger than the sum of its proper divisors (16658608084).

21347432156 is a wasteful number, since it uses less digits than its factorization.

21347432156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35413 (or 35411 counting only the distinct ones).

The product of its digits is 120960, while the sum is 38.

The spelling of 21347432156 in words is "twenty-one billion, three hundred forty-seven million, four hundred thirty-two thousand, one hundred fifty-six".