21711572536 has 64 divisors (see below), whose sum is σ = 43746998400. Its totient is φ = 10070356608.

The previous prime is 21711572527. The next prime is 21711572537. The reversal of 21711572536 is 63527511712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21711572537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4533135 + ... + 4537921.

It is an arithmetic number, because the mean of its divisors is an integer number (683546850).

Almost surely, 2^21711572536 is an apocalyptic number.

It is an amenable number.

21711572536 is an abundant number, since it is smaller than the sum of its proper divisors (22035425864).

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

21711572536 is a wasteful number, since it uses less digits than its factorization.

21711572536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428 (or 5424 counting only the distinct ones).

The product of its digits is 88200, while the sum is 40.

The spelling of 21711572536 in words is "twenty-one billion, seven hundred eleven million, five hundred seventy-two thousand, five hundred thirty-six".