21211200220123 has 8 divisors (see below), whose sum is σ = 21376779680592. Its totient is φ = 21045776603136.

The previous prime is 21211200220087. The next prime is 21211200220127. The reversal of 21211200220123 is 32102200211212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211200220123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211200220123.

It is not an unprimeable number, because it can be changed into a prime (21211200220127) 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, 38687590 + ... + 39232027.

It is an arithmetic number, because the mean of its divisors is an integer number (2672097460074).

Almost surely, 2^{21211200220123} is an apocalyptic number.

21211200220123 is a deficient number, since it is larger than the sum of its proper divisors (165579460469).

21211200220123 is a wasteful number, since it uses less digits than its factorization.

21211200220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77921741.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21211200220123 its reverse (32102200211212), we get a palindrome (53313400431335).

The spelling of 21211200220123 in words is "twenty-one trillion, two hundred eleven billion, two hundred million, two hundred twenty thousand, one hundred twenty-three".