21113120122 has 4 divisors (see below), whose sum is σ = 31669680186. Its totient is φ = 10556560060.

The previous prime is 21113120117. The next prime is 21113120129. The reversal of 21113120122 is 22102131112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19533137121 + 1579983001 = 139761^2 + 39749^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21113120096 and 21113120105.

It is not an unprimeable number, because it can be changed into a prime (21113120129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278280029 + ... + 5278280032.

Almost surely, 2^21113120122 is an apocalyptic number.

21113120122 is a deficient number, since it is larger than the sum of its proper divisors (10556560064).

21113120122 is a wasteful number, since it uses less digits than its factorization.

21113120122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556560063.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21113120122 its reverse (22102131112), we get a palindrome (43215251234).

The spelling of 21113120122 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty thousand, one hundred twenty-two".