15749118221 has 8 divisors (see below), whose sum is σ = 16607476320. Its totient is φ = 14893705872.

The previous prime is 15749118211. The next prime is 15749118299. The reversal of 15749118221 is 12281194751.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15749118221 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 (15749118211) 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, 725450 + ... + 746843.

It is an arithmetic number, because the mean of its divisors is an integer number (2075934540).

Almost surely, 2^15749118221 is an apocalyptic number.

It is an amenable number.

15749118221 is a deficient number, since it is larger than the sum of its proper divisors (858358099).

15749118221 is a wasteful number, since it uses less digits than its factorization.

15749118221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472875.

The product of its digits is 40320, while the sum is 41.

The spelling of 15749118221 in words is "fifteen billion, seven hundred forty-nine million, one hundred eighteen thousand, two hundred twenty-one".