21023242 has 32 divisors (see below), whose sum is σ = 34401024. Its totient is φ = 9609600.

The previous prime is 21023213. The next prime is 21023257. The reversal of 21023242 is 24232012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133828 + ... + 133984.

It is an arithmetic number, because the mean of its divisors is an integer number (1075032).

Almost surely, 2^21023242 is an apocalyptic number.

21023242 is a deficient number, since it is larger than the sum of its proper divisors (13377782).

21023242 is a wasteful number, since it uses less digits than its factorization.

21023242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21023242 is about 4585.1109037841. The cubic root of 21023242 is about 275.9941625174.

Adding to 21023242 its reverse (24232012), we get a palindrome (45255254).

The spelling of 21023242 in words is "twenty-one million, twenty-three thousand, two hundred forty-two".