21111121322 has 32 divisors (see below), whose sum is σ = 34103235600. Its totient is φ = 9766010880.

The previous prime is 21111121301. The next prime is 21111121333. The reversal of 21111121322 is 22312111112.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4242047161 + 16869074161 = 65131^2 + 129881^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a self number, because there is not a number n which added to its sum of digits gives 21111121322.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 469922 + ... + 512882.

Almost surely, 2^21111121322 is an apocalyptic number.

21111121322 is a deficient number, since it is larger than the sum of its proper divisors (12992114278).

21111121322 is a wasteful number, since it uses less digits than its factorization.

21111121322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43226.

The product of its digits is 48, while the sum is 17.

Adding to 21111121322 its reverse (22312111112), we get a palindrome (43423232434).

The spelling of 21111121322 in words is "twenty-one billion, one hundred eleven million, one hundred twenty-one thousand, three hundred twenty-two".