21442179 has 16 divisors (see below), whose sum is σ = 31267584. Its totient is φ = 12962400.

The previous prime is 21442163. The next prime is 21442229. The reversal of 21442179 is 97124412.

It is not a de Polignac number, because 21442179 - 2⁴ = 21442163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21442159) 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, 21322 + ... + 22304.

It is an arithmetic number, because the mean of its divisors is an integer number (1954224).

Almost surely, 2^21442179 is an apocalyptic number.

21442179 is a deficient number, since it is larger than the sum of its proper divisors (9825405).

21442179 is a wasteful number, since it uses less digits than its factorization.

21442179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1658.

The product of its digits is 4032, while the sum is 30.

The square root of 21442179 is about 4630.5700513004. The cubic root of 21442179 is about 277.8153933712.

The spelling of 21442179 in words is "twenty-one million, four hundred forty-two thousand, one hundred seventy-nine".