13421631 has 4 divisors (see below), whose sum is σ = 17895512. Its totient is φ = 8947752.

The previous prime is 13421591. The next prime is 13421651. The reversal of 13421631 is 13612431.

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

It is not a de Polignac number, because 13421631 - 2⁶ = 13421567 is a prime.

It is a super-2 number, since 2×13421631² = 360280357400322, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 13421598 and 13421607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13421651) 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, 2236936 + ... + 2236941.

It is an arithmetic number, because the mean of its divisors is an integer number (4473878).

Almost surely, 2^13421631 is an apocalyptic number.

13421631 is a deficient number, since it is larger than the sum of its proper divisors (4473881).

13421631 is an equidigital number, since it uses as much as digits as its factorization.

13421631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473880.

The product of its digits is 432, while the sum is 21.

The square root of 13421631 is about 3663.5544215966. The cubic root of 13421631 is about 237.6485113623.

The spelling of 13421631 in words is "thirteen million, four hundred twenty-one thousand, six hundred thirty-one".