13202920921 has 2 divisors, whose sum is σ = 13202920922. Its totient is φ = 13202920920.

The previous prime is 13202920909. The next prime is 13202920961. The reversal of 13202920921 is 12902920231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6854018521 + 6348902400 = 82789^2 + 79680^2 .

It is a cyclic number.

It is not a de Polignac number, because 13202920921 - 2¹³ = 13202912729 is a prime.

It is not a weakly prime, because it can be changed into another prime (13202920961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6601460460 + 6601460461.

It is an arithmetic number, because the mean of its divisors is an integer number (6601460461).

Almost surely, 2^13202920921 is an apocalyptic number.

It is an amenable number.

13202920921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13202920921 is an equidigital number, since it uses as much as digits as its factorization.

13202920921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The spelling of 13202920921 in words is "thirteen billion, two hundred two million, nine hundred twenty thousand, nine hundred twenty-one".