21112203102123 has 32 divisors (see below), whose sum is σ = 32472647894016. Its totient is φ = 11951100822528.

The previous prime is 21112203102073. The next prime is 21112203102169. The reversal of 21112203102123 is 32120130221112.

It is not a de Polignac number, because 21112203102123 - 2²⁴ = 21112186324907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 21112203102123.

It is not an unprimeable number, because it can be changed into a prime (21112203106123) 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, 2214186 + ... + 6864912.

It is an arithmetic number, because the mean of its divisors is an integer number (1014770246688).

Almost surely, 2^{21112203102123} is an apocalyptic number.

21112203102123 is a deficient number, since it is larger than the sum of its proper divisors (11360444791893).

21112203102123 is a wasteful number, since it uses less digits than its factorization.

21112203102123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652763.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21112203102123 its reverse (32120130221112), we get a palindrome (53232333323235).

The spelling of 21112203102123 in words is "twenty-one trillion, one hundred twelve billion, two hundred three million, one hundred two thousand, one hundred twenty-three".