21113111222 has 32 divisors (see below), whose sum is σ = 37893139200. Its totient is φ = 8631187488.

The previous prime is 21113111213. The next prime is 21113111249. The reversal of 21113111222 is 22211131112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113111222.

It is a congruent number.

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, 279572 + ... + 346967.

It is an arithmetic number, because the mean of its divisors is an integer number (1184160600).

Almost surely, 2^21113111222 is an apocalyptic number.

21113111222 is a deficient number, since it is larger than the sum of its proper divisors (16780027978).

21113111222 is a wasteful number, since it uses less digits than its factorization.

21113111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626660.

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

Adding to 21113111222 its reverse (22211131112), we get a palindrome (43324242334).

It can be divided in two parts, 211131112 and 22, that multiplied together give a palindrome (4644884464).

The spelling of 21113111222 in words is "twenty-one billion, one hundred thirteen million, one hundred eleven thousand, two hundred twenty-two".