21351122 has 24 divisors (see below), whose sum is σ = 34971300. Its totient is φ = 9771840.

The previous prime is 21351073. The next prime is 21351131. The reversal of 21351122 is 22115312.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 657721 + 20693401 = 811^2 + 4549^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21351122.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61004 + ... + 61352.

Almost surely, 2^21351122 is an apocalyptic number.

21351122 is a deficient number, since it is larger than the sum of its proper divisors (13620178).

21351122 is a wasteful number, since it uses less digits than its factorization.

21351122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 545 counting only the distinct ones).

The product of its digits is 120, while the sum is 17.

The square root of 21351122 is about 4620.7274319094. The cubic root of 21351122 is about 277.4215756526.

Adding to 21351122 its reverse (22115312), we get a palindrome (43466434).

The spelling of 21351122 in words is "twenty-one million, three hundred fifty-one thousand, one hundred twenty-two".