21223200123 has 32 divisors (see below), whose sum is σ = 32672102400. Its totient is φ = 13599538848.

The previous prime is 21223200109. The next prime is 21223200179. The reversal of 21223200123 is 32100232212.

It is a de Polignac number, because none of the positive numbers 2^k-21223200123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21223200096 and 21223200105.

It is not an unprimeable number, because it can be changed into a prime (21223200923) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113836 + ... + 235382.

It is an arithmetic number, because the mean of its divisors is an integer number (1021003200).

Almost surely, 2^21223200123 is an apocalyptic number.

21223200123 is a deficient number, since it is larger than the sum of its proper divisors (11448902277).

21223200123 is a wasteful number, since it uses less digits than its factorization.

21223200123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121808 (or 121802 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21223200123 its reverse (32100232212), we get a palindrome (53323432335).

The spelling of 21223200123 in words is "twenty-one billion, two hundred twenty-three million, two hundred thousand, one hundred twenty-three".