21242522 has 32 divisors (see below), whose sum is σ = 37425024. Its totient is φ = 8856000.

The previous prime is 21242521. The next prime is 21242527. The reversal of 21242522 is 22524212.

It is a junction number, because it is equal to n+sod(n) for n = 21242494 and 21242503.

It is not an unprimeable number, because it can be changed into a prime (21242521) 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, 117272 + ... + 117452.

It is an arithmetic number, because the mean of its divisors is an integer number (1169532).

Almost surely, 2^21242522 is an apocalyptic number.

21242522 is a deficient number, since it is larger than the sum of its proper divisors (16182502).

21242522 is a wasteful number, since it uses less digits than its factorization.

21242522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374.

The product of its digits is 640, while the sum is 20.

The square root of 21242522 is about 4608.9610542941. The cubic root of 21242522 is about 276.9504183870.

Adding to 21242522 its reverse (22524212), we get a palindrome (43766734).

The spelling of 21242522 in words is "twenty-one million, two hundred forty-two thousand, five hundred twenty-two".