21958264944 has 360 divisors, whose sum is σ = 80599372560. Its totient is φ = 5702780160.

The previous prime is 21958264919. The next prime is 21958264963. The reversal of 21958264944 is 44946285912.

21958264944 is a `hidden beast` number, since 2 + 19 + 582 + 6 + 4 + 9 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2557042 + ... + 2565614.

It is an arithmetic number, because the mean of its divisors is an integer number (223887146).

Almost surely, 2^21958264944 is an apocalyptic number.

21958264944 is a gapful number since it is divisible by the number (24) 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 21958264944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40299686280).

21958264944 is an abundant number, since it is smaller than the sum of its proper divisors (58641107616).

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

21958264944 is a wasteful number, since it uses less digits than its factorization.

21958264944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8626 (or 8596 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The spelling of 21958264944 in words is "twenty-one billion, nine hundred fifty-eight million, two hundred sixty-four thousand, nine hundred forty-four".