13421543251 has 4 divisors (see below), whose sum is σ = 13422345552. Its totient is φ = 13420740952.

The previous prime is 13421543189. The next prime is 13421543269. The reversal of 13421543251 is 15234512431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13421543251 - 2⁷ = 13421543123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13421543951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375511 + ... + 409696.

It is an arithmetic number, because the mean of its divisors is an integer number (3355586388).

Almost surely, 2^13421543251 is an apocalyptic number.

13421543251 is a deficient number, since it is larger than the sum of its proper divisors (802301).

13421543251 is an equidigital number, since it uses as much as digits as its factorization.

13421543251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802300.

The product of its digits is 14400, while the sum is 31.

The spelling of 13421543251 in words is "thirteen billion, four hundred twenty-one million, five hundred forty-three thousand, two hundred fifty-one".