21111222122 has 32 divisors (see below), whose sum is σ = 32610623232. Its totient is φ = 10244392704.

The previous prime is 21111222113. The next prime is 21111222151. The reversal of 21111222122 is 22122211112.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21111222122.

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, 9877838 + ... + 9879974.

It is an arithmetic number, because the mean of its divisors is an integer number (1019081976).

Almost surely, 2^21111222122 is an apocalyptic number.

21111222122 is a deficient number, since it is larger than the sum of its proper divisors (11499401110).

21111222122 is a wasteful number, since it uses less digits than its factorization.

21111222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2862.

The product of its digits is 64, while the sum is 17.

Adding to 21111222122 its reverse (22122211112), we get a palindrome (43233433234).

The spelling of 21111222122 in words is "twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-two".