21221334123 has 32 divisors (see below), whose sum is σ = 32221642752. Its totient is φ = 12297568800.

The previous prime is 21221334091. The next prime is 21221334133. The reversal of 21221334123 is 32143312212.

It is not a de Polignac number, because 21221334123 - 2⁵ = 21221334091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221334093 and 21221334102.

It is not an unprimeable number, because it can be changed into a prime (21221334133) 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, 3922086 + ... + 3927492.

It is an arithmetic number, because the mean of its divisors is an integer number (1006926336).

Almost surely, 2^21221334123 is an apocalyptic number.

21221334123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21221334123 is a deficient number, since it is larger than the sum of its proper divisors (11000308629).

21221334123 is a wasteful number, since it uses less digits than its factorization.

21221334123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10615.

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

Adding to 21221334123 its reverse (32143312212), we get a palindrome (53364646335).

The spelling of 21221334123 in words is "twenty-one billion, two hundred twenty-one million, three hundred thirty-four thousand, one hundred twenty-three".