21607042 has 8 divisors (see below), whose sum is σ = 32452416. Its totient is φ = 10789572.

The previous prime is 21607013. The next prime is 21607063. The reversal of 21607042 is 24070612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4918 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (4056552).

Almost surely, 2^21607042 is an apocalyptic number.

21607042 is a deficient number, since it is larger than the sum of its proper divisors (10845374).

21607042 is a wasteful number, since it uses less digits than its factorization.

21607042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13952.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21607042 is about 4648.3375522868. The cubic root of 21607042 is about 278.5255916067.

Adding to 21607042 its reverse (24070612), we get a palindrome (45677654).

The spelling of 21607042 in words is "twenty-one million, six hundred seven thousand, forty-two".