21113112122 has 16 divisors (see below), whose sum is σ = 32647639680. Its totient is φ = 10235467872.

The previous prime is 21113112019. The next prime is 21113112143. The reversal of 21113112122 is 22121131112.

It is a happy number.

It is a super-2 number, since 2×21113112122² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21113112122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216898 + ... + 1234125.

It is an arithmetic number, because the mean of its divisors is an integer number (2040477480).

Almost surely, 2^21113112122 is an apocalyptic number.

21113112122 is a deficient number, since it is larger than the sum of its proper divisors (11534527558).

21113112122 is a wasteful number, since it uses less digits than its factorization.

21113112122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451157.

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

Adding to 21113112122 its reverse (22121131112), we get a palindrome (43234243234).

The spelling of 21113112122 in words is "twenty-one billion, one hundred thirteen million, one hundred twelve thousand, one hundred twenty-two".