21976700928 has 384 divisors, whose sum is σ = 75290342400. Its totient is φ = 5540806656.

The previous prime is 21976700899. The next prime is 21976700953. The reversal of 21976700928 is 82900767912.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×21976700928² (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, 12858538 + ... + 12860246.

It is an arithmetic number, because the mean of its divisors is an integer number (196068600).

Almost surely, 2^21976700928 is an apocalyptic number.

21976700928 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21976700928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37645171200).

21976700928 is an abundant number, since it is smaller than the sum of its proper divisors (53313641472).

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

21976700928 is a wasteful number, since it uses less digits than its factorization.

21976700928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1757 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 51.

The spelling of 21976700928 in words is "twenty-one billion, nine hundred seventy-six million, seven hundred thousand, nine hundred twenty-eight".