21000112012111 has 4 divisors (see below), whose sum is σ = 22105381065400. Its totient is φ = 19894842958824.

The previous prime is 21000112012079. The next prime is 21000112012129. The reversal of 21000112012111 is 11121021100012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21000112012111 - 2⁵ = 21000112012079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000112012091 and 21000112012100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000112012181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 552634526616 + ... + 552634526653.

It is an arithmetic number, because the mean of its divisors is an integer number (5526345266350).

Almost surely, 2^{21000112012111} is an apocalyptic number.

21000112012111 is a deficient number, since it is larger than the sum of its proper divisors (1105269053289).

21000112012111 is a wasteful number, since it uses less digits than its factorization.

21000112012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1105269053288.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21000112012111 its reverse (11121021100012), we get a palindrome (32121133112123).

The spelling of 21000112012111 in words is "twenty-one trillion, one hundred twelve million, twelve thousand, one hundred eleven".