21222132123 has 8 divisors (see below), whose sum is σ = 28439812368. Its totient is φ = 14076269984.

The previous prime is 21222132119. The next prime is 21222132149. The reversal of 21222132123 is 32123122212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21222132123 - 2² = 21222132119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222132123.

It is not an unprimeable number, because it can be changed into a prime (21222132103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17953836 + ... + 17955017.

It is an arithmetic number, because the mean of its divisors is an integer number (3554976546).

Almost surely, 2^21222132123 is an apocalyptic number.

21222132123 is a deficient number, since it is larger than the sum of its proper divisors (7217680245).

21222132123 is a wasteful number, since it uses less digits than its factorization.

21222132123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35909053.

The product of its digits is 576, while the sum is 21.

Adding to 21222132123 its reverse (32123122212), we get a palindrome (53345254335).

The spelling of 21222132123 in words is "twenty-one billion, two hundred twenty-two million, one hundred thirty-two thousand, one hundred twenty-three".