21112212100123 has 8 divisors (see below), whose sum is σ = 22502147375520. Its totient is φ = 19738725763200.

The previous prime is 21112212100117. The next prime is 21112212100151. The reversal of 21112212100123 is 32100121221112.

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-21112212100123 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 21112212100123.

It is not an unprimeable number, because it can be changed into a prime (21112212100183) 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, 4112231968 + ... + 4112237101.

It is an arithmetic number, because the mean of its divisors is an integer number (2812768421940).

Almost surely, 2^{21112212100123} is an apocalyptic number.

21112212100123 is a deficient number, since it is larger than the sum of its proper divisors (1389935275397).

21112212100123 is a wasteful number, since it uses less digits than its factorization.

21112212100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8224469237.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21112212100123 its reverse (32100121221112), we get a palindrome (53212333321235).

The spelling of 21112212100123 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, one hundred thousand, one hundred twenty-three".