21262442 has 16 divisors (see below), whose sum is σ = 33687360. Its totient is φ = 10044672.

The previous prime is 21262433. The next prime is 21262453. The reversal of 21262442 is 24426212.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 1034 + ... + 6602.

It is an arithmetic number, because the mean of its divisors is an integer number (2105460).

Almost surely, 2^21262442 is an apocalyptic number.

21262442 is a deficient number, since it is larger than the sum of its proper divisors (12424918).

21262442 is a wasteful number, since it uses less digits than its factorization.

21262442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5677.

The product of its digits is 1536, while the sum is 23.

The square root of 21262442 is about 4611.1215555437. The cubic root of 21262442 is about 277.0369606656.

Adding to 21262442 its reverse (24426212), we get a palindrome (45688654).

The spelling of 21262442 in words is "twenty-one million, two hundred sixty-two thousand, four hundred forty-two".