15914221 has 8 divisors (see below), whose sum is σ = 16150784. Its totient is φ = 15679440.

The previous prime is 15914209. The next prime is 15914231. The reversal of 15914221 is 12241951.

It is a happy number.

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 15914221 - 2¹¹ = 15912173 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 (15914231) 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, 37591 + ... + 38011.

It is an arithmetic number, because the mean of its divisors is an integer number (2018848).

Almost surely, 2^15914221 is an apocalyptic number.

It is an amenable number.

15914221 is a deficient number, since it is larger than the sum of its proper divisors (236563).

15914221 is a wasteful number, since it uses less digits than its factorization.

15914221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its digits is 720, while the sum is 25.

The square root of 15914221 is about 3989.2632151815. The cubic root of 15914221 is about 251.5330913064.

The spelling of 15914221 in words is "fifteen million, nine hundred fourteen thousand, two hundred twenty-one".