13521222431 has 2 divisors, whose sum is σ = 13521222432. Its totient is φ = 13521222430.

The previous prime is 13521222427. The next prime is 13521222439. The reversal of 13521222431 is 13422212531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13521222431 - 2² = 13521222427 is a prime.

It is a super-2 number, since 2×13521222431² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13521222431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13521222439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760611215 + 6760611216.

It is an arithmetic number, because the mean of its divisors is an integer number (6760611216).

Almost surely, 2^13521222431 is an apocalyptic number.

13521222431 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521222431 is an equidigital number, since it uses as much as digits as its factorization.

13521222431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

Adding to 13521222431 its reverse (13422212531), we get a palindrome (26943434962).

The spelling of 13521222431 in words is "thirteen billion, five hundred twenty-one million, two hundred twenty-two thousand, four hundred thirty-one".