21911885884 has 96 divisors (see below), whose sum is σ = 46180238720. Its totient is φ = 8901964800.

The previous prime is 21911885833. The next prime is 21911885927. The reversal of 21911885884 is 48858811912.

It is a super-2 number, since 2×21911885884² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6886774 + ... + 6889954.

Almost surely, 2^21911885884 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21911885884, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23090119360).

21911885884 is an abundant number, since it is smaller than the sum of its proper divisors (24268352836).

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

21911885884 is a wasteful number, since it uses less digits than its factorization.

21911885884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3399 (or 3397 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 55.

The spelling of 21911885884 in words is "twenty-one billion, nine hundred eleven million, eight hundred eighty-five thousand, eight hundred eighty-four".