13154235221 has 4 divisors (see below), whose sum is σ = 13460147712. Its totient is φ = 12848322732.

The previous prime is 13154235203. The next prime is 13154235229. The reversal of 13154235221 is 12253245131.

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 a de Polignac number, because none of the positive numbers 2^k-13154235221 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 (13154235229) 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, 152956181 + ... + 152956266.

It is an arithmetic number, because the mean of its divisors is an integer number (3365036928).

Almost surely, 2^13154235221 is an apocalyptic number.

It is an amenable number.

13154235221 is a deficient number, since it is larger than the sum of its proper divisors (305912491).

13154235221 is an equidigital number, since it uses as much as digits as its factorization.

13154235221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305912490.

The product of its digits is 7200, while the sum is 29.

The spelling of 13154235221 in words is "thirteen billion, one hundred fifty-four million, two hundred thirty-five thousand, two hundred twenty-one".