21911522984 has 32 divisors (see below), whose sum is σ = 44562756000. Its totient is φ = 10040248512.

The previous prime is 21911522981. The next prime is 21911522987. The reversal of 21911522984 is 48922511912.

It is an interprime number because it is at equal distance from previous prime (21911522981) and next prime (21911522987).

It is a super-2 number, since 2×21911522984² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21911522981) 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, 743414 + ... + 772325.

It is an arithmetic number, because the mean of its divisors is an integer number (1392586125).

Almost surely, 2^21911522984 is an apocalyptic number.

It is an amenable number.

21911522984 is an abundant number, since it is smaller than the sum of its proper divisors (22651233016).

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

21911522984 is a wasteful number, since it uses less digits than its factorization.

21911522984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515897 (or 1515893 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The spelling of 21911522984 in words is "twenty-one billion, nine hundred eleven million, five hundred twenty-two thousand, nine hundred eighty-four".