21838236364 has 12 divisors (see below), whose sum is σ = 43676472784. Its totient is φ = 9359244144.

The previous prime is 21838236361. The next prime is 21838236367. The reversal of 21838236364 is 46363283812.

It is an interprime number because it is at equal distance from previous prime (21838236361) and next prime (21838236367).

21838236364 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21838236361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389968479 + ... + 389968534.

Almost surely, 2^21838236364 is an apocalyptic number.

It is an amenable number.

21838236364 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21838236364 is a wasteful number, since it uses less digits than its factorization.

21838236364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779937024 (or 779937022 counting only the distinct ones).

The product of its digits is 995328, while the sum is 46.

The spelling of 21838236364 in words is "twenty-one billion, eight hundred thirty-eight million, two hundred thirty-six thousand, three hundred sixty-four".