21140947572 has 24 divisors (see below), whose sum is σ = 49683765600. Its totient is φ = 6996284256.

The previous prime is 21140947537. The next prime is 21140947573. The reversal of 21140947572 is 27574904112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21140947573) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6335547 + ... + 6338882.

It is an arithmetic number, because the mean of its divisors is an integer number (2070156900).

Almost surely, 2^21140947572 is an apocalyptic number.

It is an amenable number.

21140947572 is an abundant number, since it is smaller than the sum of its proper divisors (28542818028).

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

21140947572 is a wasteful number, since it uses less digits than its factorization.

21140947572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12674575 (or 12674573 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 42.

The spelling of 21140947572 in words is "twenty-one billion, one hundred forty million, nine hundred forty-seven thousand, five hundred seventy-two".