13445351221 has 8 divisors (see below), whose sum is σ = 14307796800. Its totient is φ = 12590854848.

The previous prime is 13445351191. The next prime is 13445351233. The reversal of 13445351221 is 12215354431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13445351221 - 2²⁵ = 13411796789 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 (13445351251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1983811 + ... + 1990576.

It is an arithmetic number, because the mean of its divisors is an integer number (1788474600).

Almost surely, 2^13445351221 is an apocalyptic number.

It is an amenable number.

13445351221 is a deficient number, since it is larger than the sum of its proper divisors (862445579).

13445351221 is a wasteful number, since it uses less digits than its factorization.

13445351221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974603.

The product of its digits is 14400, while the sum is 31.

The spelling of 13445351221 in words is "thirteen billion, four hundred forty-five million, three hundred fifty-one thousand, two hundred twenty-one".