21321122 has 4 divisors (see below), whose sum is σ = 31981686. Its totient is φ = 10660560.

The previous prime is 21321121. The next prime is 21321133. The reversal of 21321122 is 22112312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12327121 + 8994001 = 3511^2 + 2999^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21321097 and 21321106.

It is not an unprimeable number, because it can be changed into a prime (21321121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5330279 + ... + 5330282.

Almost surely, 2^21321122 is an apocalyptic number.

21321122 is a deficient number, since it is larger than the sum of its proper divisors (10660564).

21321122 is a wasteful number, since it uses less digits than its factorization.

21321122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10660563.

The product of its digits is 48, while the sum is 14.

The square root of 21321122 is about 4617.4800486846. The cubic root of 21321122 is about 277.2915817299.

Adding to 21321122 its reverse (22112312), we get a palindrome (43433434).

The spelling of 21321122 in words is "twenty-one million, three hundred twenty-one thousand, one hundred twenty-two".