21576994 has 16 divisors (see below), whose sum is σ = 33477696. Its totient is φ = 10422000.

The previous prime is 21576983. The next prime is 21577001. The reversal of 21576994 is 49967512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21576994.

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 in 7 ways as a sum of consecutive naturals, for example, 10209 + ... + 12139.

It is an arithmetic number, because the mean of its divisors is an integer number (2092356).

Almost surely, 2^21576994 is an apocalyptic number.

21576994 is a deficient number, since it is larger than the sum of its proper divisors (11900702).

21576994 is a wasteful number, since it uses less digits than its factorization.

21576994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121.

The product of its digits is 136080, while the sum is 43.

The square root of 21576994 is about 4645.1043045340. The cubic root of 21576994 is about 278.3964204548.

The spelling of 21576994 in words is "twenty-one million, five hundred seventy-six thousand, nine hundred ninety-four".