21887437953236 has 12 divisors (see below), whose sum is σ = 38334593521812. Its totient is φ = 10934696947008.

The previous prime is 21887437953209. The next prime is 21887437953263. The reversal of 21887437953236 is 63235973478812.

It is an interprime number because it is at equal distance from previous prime (21887437953209) and next prime (21887437953263).

It can be written as a sum of positive squares in 2 ways, for example, as 457389805636 + 21430048147600 = 676306^2 + 4629260^2 .

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, 2255501945 + ... + 2255511648.

It is an arithmetic number, because the mean of its divisors is an integer number (3194549460151).

Almost surely, 2^{21887437953236} is an apocalyptic number.

It is an amenable number.

21887437953236 is a deficient number, since it is larger than the sum of its proper divisors (16447155568576).

21887437953236 is a wasteful number, since it uses less digits than its factorization.

21887437953236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4511014810 (or 4511014808 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 68.

The spelling of 21887437953236 in words is "twenty-one trillion, eight hundred eighty-seven billion, four hundred thirty-seven million, nine hundred fifty-three thousand, two hundred thirty-six".