21322210 has 32 divisors (see below), whose sum is σ = 47238912. Its totient is φ = 6747840.

The previous prime is 21322207. The next prime is 21322229. The reversal of 21322210 is 1222312.

It is a Harshad number since it is a multiple of its sum of digits (13).

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, 10806 + ... + 12625.

It is an arithmetic number, because the mean of its divisors is an integer number (1476216).

Almost surely, 2^21322210 is an apocalyptic number.

21322210 is an abundant number, since it is smaller than the sum of its proper divisors (25916702).

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

21322210 is a wasteful number, since it uses less digits than its factorization.

21322210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23458.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 21322210 is about 4617.5978603599. The cubic root of 21322210 is about 277.2962983064.

Adding to 21322210 its reverse (1222312), we get a palindrome (22544522).

The spelling of 21322210 in words is "twenty-one million, three hundred twenty-two thousand, two hundred ten".