15221996 has 6 divisors (see below), whose sum is σ = 26638500. Its totient is φ = 7610996.

The previous prime is 15221963. The next prime is 15222041. The reversal of 15221996 is 69912251.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1902746 + ... + 1902753.

It is an arithmetic number, because the mean of its divisors is an integer number (4439750).

Almost surely, 2^15221996 is an apocalyptic number.

It is an amenable number.

15221996 is a deficient number, since it is larger than the sum of its proper divisors (11416504).

15221996 is a wasteful number, since it uses less digits than its factorization.

15221996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805503 (or 3805501 counting only the distinct ones).

The product of its digits is 9720, while the sum is 35.

The square root of 15221996 is about 3901.5376455956. The cubic root of 15221996 is about 247.8318970058.

The spelling of 15221996 in words is "fifteen million, two hundred twenty-one thousand, nine hundred ninety-six".