21052231013 has 8 divisors (see below), whose sum is σ = 23005879680. Its totient is φ = 19105217280.

The previous prime is 21052231003. The next prime is 21052231043. The reversal of 21052231013 is 31013225012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21052231013 - 2⁶ = 21052230949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052231003) 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, 1652093 + ... + 1664786.

It is an arithmetic number, because the mean of its divisors is an integer number (2875734960).

Almost surely, 2^21052231013 is an apocalyptic number.

It is an amenable number.

21052231013 is a deficient number, since it is larger than the sum of its proper divisors (1953648667).

21052231013 is a wasteful number, since it uses less digits than its factorization.

21052231013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317467.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21052231013 its reverse (31013225012), we get a palindrome (52065456025).

The spelling of 21052231013 in words is "twenty-one billion, fifty-two million, two hundred thirty-one thousand, thirteen".