13421531 has 4 divisors (see below), whose sum is σ = 13477464. Its totient is φ = 13365600.

The previous prime is 13421521. The next prime is 13421533. The reversal of 13421531 is 13512431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13512431 = 23 ⋅587497.

It is a cyclic number.

It is not a de Polignac number, because 13421531 - 2²² = 9227227 is a prime.

It is a super-2 number, since 2×13421531² = 360274988767922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13421533) 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, 27605 + ... + 28086.

It is an arithmetic number, because the mean of its divisors is an integer number (3369366).

Almost surely, 2^13421531 is an apocalyptic number.

13421531 is a deficient number, since it is larger than the sum of its proper divisors (55933).

13421531 is an equidigital number, since it uses as much as digits as its factorization.

13421531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55932.

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

The square root of 13421531 is about 3663.5407736232. The cubic root of 13421531 is about 237.6479211482.

Adding to 13421531 its reverse (13512431), we get a palindrome (26933962).

The spelling of 13421531 in words is "thirteen million, four hundred twenty-one thousand, five hundred thirty-one".