13202157221 has 4 divisors (see below), whose sum is σ = 14402353344. Its totient is φ = 12001961100.

The previous prime is 13202157203. The next prime is 13202157247. The reversal of 13202157221 is 12275120231.

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.

It is a cyclic number.

It is not a de Polignac number, because 13202157221 - 2¹⁰ = 13202156197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13202457221) 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, 600098045 + ... + 600098066.

It is an arithmetic number, because the mean of its divisors is an integer number (3600588336).

Almost surely, 2^13202157221 is an apocalyptic number.

13202157221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13202157221 is a deficient number, since it is larger than the sum of its proper divisors (1200196123).

13202157221 is a wasteful number, since it uses less digits than its factorization.

13202157221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200196122.

The product of its (nonzero) digits is 1680, while the sum is 26.

Adding to 13202157221 its reverse (12275120231), we get a palindrome (25477277452).

The spelling of 13202157221 in words is "thirteen billion, two hundred two million, one hundred fifty-seven thousand, two hundred twenty-one".