21313222 has 16 divisors (see below), whose sum is σ = 36901152. Its totient is φ = 9043200.

The previous prime is 21313207. The next prime is 21313241. The reversal of 21313222 is 22231312.

It is a junction number, because it is equal to n+sod(n) for n = 21313196 and 21313205.

It is a congruent number.

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, 6123 + ... + 8950.

It is an arithmetic number, because the mean of its divisors is an integer number (2306322).

Almost surely, 2^21313222 is an apocalyptic number.

21313222 is a deficient number, since it is larger than the sum of its proper divisors (15587930).

21313222 is a wasteful number, since it uses less digits than its factorization.

21313222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15183.

The product of its digits is 144, while the sum is 16.

The square root of 21313222 is about 4616.6245244767. The cubic root of 21313222 is about 277.2573297159.

Adding to 21313222 its reverse (22231312), we get a palindrome (43544534).

The spelling of 21313222 in words is "twenty-one million, three hundred thirteen thousand, two hundred twenty-two".