21570525336 has 64 divisors (see below), whose sum is σ = 54722822400. Its totient is φ = 7084112000.

The previous prime is 21570525329. The next prime is 21570525337. The reversal of 21570525336 is 63352507512.

It is a junction number, because it is equal to n+sod(n) for n = 21570525294 and 21570525303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21570525337) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3235975 + ... + 3242633.

It is an arithmetic number, because the mean of its divisors is an integer number (855044100).

Almost surely, 2^21570525336 is an apocalyptic number.

It is an amenable number.

21570525336 is an abundant number, since it is smaller than the sum of its proper divisors (33152297064).

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

21570525336 is a wasteful number, since it uses less digits than its factorization.

21570525336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8640 (or 8636 counting only the distinct ones).

The product of its (nonzero) digits is 189000, while the sum is 39.

The spelling of 21570525336 in words is "twenty-one billion, five hundred seventy million, five hundred twenty-five thousand, three hundred thirty-six".