21122343123 has 12 divisors (see below), whose sum is σ = 32761185480. Its totient is φ = 12069910272.

The previous prime is 21122343113. The next prime is 21122343133. The reversal of 21122343123 is 32134322112.

It is an interprime number because it is at equal distance from previous prime (21122343113) and next prime (21122343133).

It is not a de Polignac number, because 21122343123 - 2⁵ = 21122343091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21122343093 and 21122343102.

It is not an unprimeable number, because it can be changed into a prime (21122343113) 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, 71844558 + ... + 71844851.

It is an arithmetic number, because the mean of its divisors is an integer number (2730098790).

Almost surely, 2^21122343123 is an apocalyptic number.

21122343123 is a deficient number, since it is larger than the sum of its proper divisors (11638842357).

21122343123 is a wasteful number, since it uses less digits than its factorization.

21122343123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143689426 (or 143689419 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

Adding to 21122343123 its reverse (32134322112), we get a palindrome (53256665235).

The spelling of 21122343123 in words is "twenty-one billion, one hundred twenty-two million, three hundred forty-three thousand, one hundred twenty-three".