21742522 has 8 divisors (see below), whose sum is σ = 32980500. Its totient is φ = 10749024.

The previous prime is 21742493. The next prime is 21742571. The reversal of 21742522 is 22524712.

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 866761 = 4569^2 + 931^2 .

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, 60897 + ... + 61252.

Almost surely, 2^21742522 is an apocalyptic number.

21742522 is a deficient number, since it is larger than the sum of its proper divisors (11237978).

21742522 is a wasteful number, since it uses less digits than its factorization.

21742522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122240.

The product of its digits is 2240, while the sum is 25.

The square root of 21742522 is about 4662.8877318675. The cubic root of 21742522 is about 279.1065141455.

The spelling of 21742522 in words is "twenty-one million, seven hundred forty-two thousand, five hundred twenty-two".