21213322 has 8 divisors (see below), whose sum is σ = 34267716. Its totient is φ = 9790752.

The previous prime is 21213293. The next prime is 21213341. The reversal of 21213322 is 22331212.

It can be written as a sum of positive squares in 2 ways, for example, as 20875761 + 337561 = 4569^2 + 581^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21213296 and 21213305.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407923 + ... + 407974.

Almost surely, 2^21213322 is an apocalyptic number.

21213322 is a deficient number, since it is larger than the sum of its proper divisors (13054394).

21213322 is a wasteful number, since it uses less digits than its factorization.

21213322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815912.

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

The square root of 21213322 is about 4605.7922228429. The cubic root of 21213322 is about 276.8234613886.

Adding to 21213322 its reverse (22331212), we get a palindrome (43544534).

The spelling of 21213322 in words is "twenty-one million, two hundred thirteen thousand, three hundred twenty-two".