21122000123 has 12 divisors (see below), whose sum is σ = 25863674760. Its totient is φ = 17151698592.

The previous prime is 21122000101. The next prime is 21122000143. The reversal of 21122000123 is 32100022112.

It is a happy number.

It is not a de Polignac number, because 21122000123 - 2²⁶ = 21054891259 is a prime.

It is a super-2 number, since 2×21122000123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122000098 and 21122000107.

It is not an unprimeable number, because it can be changed into a prime (21122000143) 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, 11342786 + ... + 11344647.

It is an arithmetic number, because the mean of its divisors is an integer number (2155306230).

Almost surely, 2^21122000123 is an apocalyptic number.

21122000123 is a deficient number, since it is larger than the sum of its proper divisors (4741674637).

21122000123 is a wasteful number, since it uses less digits than its factorization.

21122000123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22687466 (or 22687459 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21122000123 its reverse (32100022112), we get a palindrome (53222022235).

The spelling of 21122000123 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty-three", and thus it is an aban number.