21667947452 has 12 divisors (see below), whose sum is σ = 38077566240. Its totient is φ = 10788642816.

The previous prime is 21667947421. The next prime is 21667947493. The reversal of 21667947452 is 25474976612.

It is a junction number, because it is equal to n+sod(n) for n = 21667947394 and 21667947403.

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, 11331653 + ... + 11333564.

It is an arithmetic number, because the mean of its divisors is an integer number (3173130520).

Almost surely, 2^21667947452 is an apocalyptic number.

It is an amenable number.

21667947452 is a deficient number, since it is larger than the sum of its proper divisors (16409618788).

21667947452 is a wasteful number, since it uses less digits than its factorization.

21667947452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22665460 (or 22665458 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 53.

The spelling of 21667947452 in words is "twenty-one billion, six hundred sixty-seven million, nine hundred forty-seven thousand, four hundred fifty-two".