21322242 has 24 divisors (see below), whose sum is σ = 48207744. Its totient is φ = 6798264.

The previous prime is 21322241. The next prime is 21322277. The reversal of 21322242 is 24222312.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21322241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25338 + ... + 26165.

It is an arithmetic number, because the mean of its divisors is an integer number (2008656).

Almost surely, 2^21322242 is an apocalyptic number.

21322242 is an abundant number, since it is smaller than the sum of its proper divisors (26885502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21322242 is a wasteful number, since it uses less digits than its factorization.

21322242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51534 (or 51531 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 21322242 is about 4617.6013253636. The cubic root of 21322242 is about 277.2964370269.

Adding to 21322242 its reverse (24222312), we get a palindrome (45544554).

The spelling of 21322242 in words is "twenty-one million, three hundred twenty-two thousand, two hundred forty-two".