21576142 has 16 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 9204120.

The previous prime is 21576133. The next prime is 21576161. The reversal of 21576142 is 24167512.

It is a self number, because there is not a number n which added to its sum of digits gives 21576142.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334 + ... + 6577.

It is an arithmetic number, because the mean of its divisors is an integer number (2322432).

Almost surely, 2^21576142 is an apocalyptic number.

21576142 is a deficient number, since it is larger than the sum of its proper divisors (15582770).

21576142 is a wasteful number, since it uses less digits than its factorization.

21576142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7143.

The product of its digits is 3360, while the sum is 28.

The square root of 21576142 is about 4645.0125941702. The cubic root of 21576142 is about 278.3927561064.

The spelling of 21576142 in words is "twenty-one million, five hundred seventy-six thousand, one hundred forty-two".