21339222 has 32 divisors (see below), whose sum is σ = 45010944. Its totient is φ = 6734400.

The previous prime is 21339221. The next prime is 21339247. The reversal of 21339222 is 22293312.

It is a junction number, because it is equal to n+sod(n) for n = 21339192 and 21339201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7522 + ... + 9962.

It is an arithmetic number, because the mean of its divisors is an integer number (1406592).

Almost surely, 2^21339222 is an apocalyptic number.

21339222 is an abundant number, since it is smaller than the sum of its proper divisors (23671722).

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

21339222 is a wasteful number, since it uses less digits than its factorization.

21339222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2524.

The product of its digits is 1296, while the sum is 24.

The square root of 21339222 is about 4619.4395763989. The cubic root of 21339222 is about 277.3700259765.

The spelling of 21339222 in words is "twenty-one million, three hundred thirty-nine thousand, two hundred twenty-two".