13421057909 has 6 divisors (see below), whose sum is σ = 15612251094. Its totient is φ = 11503763880.

The previous prime is 13421057891. The next prime is 13421057921. The reversal of 13421057909 is 90975012431.

It can be written as a sum of positive squares in only one way, i.e., 9156576100 + 4264481809 = 95690^2 + 65303^2 .

It is not a de Polignac number, because 13421057909 - 2¹² = 13421053813 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 (13421057959) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 136949522 + ... + 136949619.

It is an arithmetic number, because the mean of its divisors is an integer number (2602041849).

Almost surely, 2^13421057909 is an apocalyptic number.

It is an amenable number.

13421057909 is a deficient number, since it is larger than the sum of its proper divisors (2191193185).

13421057909 is an equidigital number, since it uses as much as digits as its factorization.

13421057909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273899155 (or 273899148 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 13421057909 in words is "thirteen billion, four hundred twenty-one million, fifty-seven thousand, nine hundred nine".