15964244221 has 8 divisors (see below), whose sum is σ = 16185121344. Its totient is φ = 15743426400.

The previous prime is 15964244147. The next prime is 15964244269. The reversal of 15964244221 is 12244246951.

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 15964244221 - 2²⁹ = 15427373309 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 (15964244291) 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, 1060296 + ... + 1075246.

It is an arithmetic number, because the mean of its divisors is an integer number (2023140168).

Almost surely, 2^15964244221 is an apocalyptic number.

It is an amenable number.

15964244221 is a deficient number, since it is larger than the sum of its proper divisors (220877123).

15964244221 is a wasteful number, since it uses less digits than its factorization.

15964244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29651.

The product of its digits is 138240, while the sum is 40.

The spelling of 15964244221 in words is "fifteen billion, nine hundred sixty-four million, two hundred forty-four thousand, two hundred twenty-one".