21888673836 has 24 divisors (see below), whose sum is σ = 51097072320. Its totient is φ = 7292867472.

The previous prime is 21888673811. The next prime is 21888673837. The reversal of 21888673836 is 63837688812.

It is a super-2 number, since 2×21888673836² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21888673836.

It is not an unprimeable number, because it can be changed into a prime (21888673837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 392406 + ... + 444701.

It is an arithmetic number, because the mean of its divisors is an integer number (2129044680).

Almost surely, 2^21888673836 is an apocalyptic number.

It is an amenable number.

21888673836 is an abundant number, since it is smaller than the sum of its proper divisors (29208398484).

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

21888673836 is a wasteful number, since it uses less digits than its factorization.

21888673836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839293 (or 839291 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 60.

The spelling of 21888673836 in words is "twenty-one billion, eight hundred eighty-eight million, six hundred seventy-three thousand, eight hundred thirty-six".