21000112121023 has 16 divisors (see below), whose sum is σ = 24361801355520. Its totient is φ = 17728917566976.

The previous prime is 21000112121003. The next prime is 21000112121039. The reversal of 21000112121023 is 32012121100012.

It is not a de Polignac number, because 21000112121023 - 2²⁵ = 21000078566591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000112120988 and 21000112121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000112121003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 124383 + ... + 6481951.

It is an arithmetic number, because the mean of its divisors is an integer number (1522612584720).

Almost surely, 2^{21000112121023} is an apocalyptic number.

21000112121023 is a deficient number, since it is larger than the sum of its proper divisors (3361689234497).

21000112121023 is an equidigital number, since it uses as much as digits as its factorization.

21000112121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364686.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21000112121023 its reverse (32012121100012), we get a palindrome (53012233221035).

The spelling of 21000112121023 in words is "twenty-one trillion, one hundred twelve million, one hundred twenty-one thousand, twenty-three".