21956739376 has 240 divisors, whose sum is σ = 52988796000. Its totient is φ = 8742666240.

The previous prime is 21956739373. The next prime is 21956739391. The reversal of 21956739376 is 67393765912.

It is a Harshad number since it is a multiple of its sum of digits (58).

Its product of digits (12859560) is a multiple of the sum of its prime factors (588).

It is a self number, because there is not a number n which added to its sum of digits gives 21956739376.

It is not an unprimeable number, because it can be changed into a prime (21956739373) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48901200 + ... + 48901648.

It is an arithmetic number, because the mean of its divisors is an integer number (220786650).

Almost surely, 2^21956739376 is an apocalyptic number.

21956739376 is a gapful number since it is divisible by the number (26) 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 21956739376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26494398000).

21956739376 is an abundant number, since it is smaller than the sum of its proper divisors (31032056624).

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

21956739376 is a wasteful number, since it uses less digits than its factorization.

21956739376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 571 counting only the distinct ones).

The product of its digits is 12859560, while the sum is 58.

The spelling of 21956739376 in words is "twenty-one billion, nine hundred fifty-six million, seven hundred thirty-nine thousand, three hundred seventy-six".