21867636436 has 12 divisors (see below), whose sum is σ = 38277951712. Its totient is φ = 10931078808.

The previous prime is 21867636421. The next prime is 21867636487. The reversal of 21867636436 is 63463676812.

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, 666840 + ... + 698863.

Almost surely, 2^21867636436 is an apocalyptic number.

It is an amenable number.

21867636436 is a deficient number, since it is larger than the sum of its proper divisors (16410315276).

21867636436 is a wasteful number, since it uses less digits than its factorization.

21867636436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369710 (or 1369708 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 52.

The spelling of 21867636436 in words is "twenty-one billion, eight hundred sixty-seven million, six hundred thirty-six thousand, four hundred thirty-six".