21522242 has 16 divisors (see below), whose sum is σ = 36958272. Its totient is φ = 9208080.

The previous prime is 21522223. The next prime is 21522251. The reversal of 21522242 is 24222512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11492 + ... + 13232.

It is an arithmetic number, because the mean of its divisors is an integer number (2309892).

Almost surely, 2^21522242 is an apocalyptic number.

21522242 is a deficient number, since it is larger than the sum of its proper divisors (15436030).

21522242 is a wasteful number, since it uses less digits than its factorization.

21522242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2633.

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

The square root of 21522242 is about 4639.2070443126. The cubic root of 21522242 is about 278.1607423997.

Adding to 21522242 its reverse (24222512), we get a palindrome (45744754).

The spelling of 21522242 in words is "twenty-one million, five hundred twenty-two thousand, two hundred forty-two".