13521222401 has 4 divisors (see below), whose sum is σ = 13808908032. Its totient is φ = 13233536772.

The previous prime is 13521222287. The next prime is 13521222409. The reversal of 13521222401 is 10422212531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10422212531 = 29 ⋅359386639.

It is a cyclic number.

It is not a de Polignac number, because 13521222401 - 2²² = 13517028097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13521222409) 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, 143842745 + ... + 143842838.

It is an arithmetic number, because the mean of its divisors is an integer number (3452227008).

Almost surely, 2^13521222401 is an apocalyptic number.

It is an amenable number.

13521222401 is a deficient number, since it is larger than the sum of its proper divisors (287685631).

13521222401 is an equidigital number, since it uses as much as digits as its factorization.

13521222401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287685630.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 13521222401 its reverse (10422212531), we get a palindrome (23943434932).

The spelling of 13521222401 in words is "thirteen billion, five hundred twenty-one million, two hundred twenty-two thousand, four hundred one".