15647241921 has 16 divisors (see below), whose sum is σ = 21605396736. Its totient is φ = 10066136976.

The previous prime is 15647241917. The next prime is 15647241991. The reversal of 15647241921 is 12914274651.

It is not a de Polignac number, because 15647241921 - 2² = 15647241917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15647241901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 719995 + ... + 741408.

It is an arithmetic number, because the mean of its divisors is an integer number (1350337296).

Almost surely, 2^15647241921 is an apocalyptic number.

It is an amenable number.

15647241921 is a deficient number, since it is larger than the sum of its proper divisors (5958154815).

15647241921 is a wasteful number, since it uses less digits than its factorization.

15647241921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461532.

The product of its digits is 120960, while the sum is 42.

The spelling of 15647241921 in words is "fifteen billion, six hundred forty-seven million, two hundred forty-one thousand, nine hundred twenty-one".