21957476552 has 128 divisors (see below), whose sum is σ = 46574161920. Its totient is φ = 9620640000.

The previous prime is 21957476537. The next prime is 21957476617. The reversal of 21957476552 is 25567475912.

It is a junction number, because it is equal to n+sod(n) for n = 21957476494 and 21957476503.

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, 83488373 + ... + 83488635.

It is an arithmetic number, because the mean of its divisors is an integer number (363860640).

Almost surely, 2^21957476552 is an apocalyptic number.

21957476552 is a gapful number since it is divisible by the number (22) 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 21957476552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23287080960).

21957476552 is an abundant number, since it is smaller than the sum of its proper divisors (24616685368).

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

21957476552 is a wasteful number, since it uses less digits than its factorization.

21957476552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 595 (or 591 counting only the distinct ones).

The product of its digits is 5292000, while the sum is 53.

It can be divided in two parts, 2195 and 7476552, that added together give a palindrome (7478747).

The spelling of 21957476552 in words is "twenty-one billion, nine hundred fifty-seven million, four hundred seventy-six thousand, five hundred fifty-two".