21123310122 has 24 divisors (see below), whose sum is σ = 45773453700. Its totient is φ = 7040136960.

The previous prime is 21123310111. The next prime is 21123310127. The reversal of 21123310122 is 22101332112.

21123310122 is a `hidden beast` number, since 211 + 2 + 331 + 0 + 122 = 666.

21123310122 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16899740001 + 4223570121 = 129999^2 + 64989^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21123310095 and 21123310104.

It is not an unprimeable number, because it can be changed into a prime (21123310127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60972 + ... + 214392.

Almost surely, 2^21123310122 is an apocalyptic number.

21123310122 is an abundant number, since it is smaller than the sum of its proper divisors (24650143578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123310122 is a wasteful number, since it uses less digits than its factorization.

21123310122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161078 (or 161075 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21123310122 its reverse (22101332112), we get a palindrome (43224642234).

The spelling of 21123310122 in words is "twenty-one billion, one hundred twenty-three million, three hundred ten thousand, one hundred twenty-two".