2112111100021 has 32 divisors (see below), whose sum is σ = 2489257225728. Its totient is φ = 1774276377600.

The previous prime is 2112111099983. The next prime is 2112111100027. The reversal of 2112111100021 is 1200011112112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2112111100021 - 2¹³ = 2112111091829 is a prime.

It is a super-2 number, since 2×2112111100021² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 2112111099974 and 2112111100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112111100027) 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, 362830 + ... + 2087071.

It is an arithmetic number, because the mean of its divisors is an integer number (77789288304).

Almost surely, 2^{2112111100021} is an apocalyptic number.

It is an amenable number.

2112111100021 is a deficient number, since it is larger than the sum of its proper divisors (377146125707).

2112111100021 is a wasteful number, since it uses less digits than its factorization.

2112111100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450061.

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

Adding to 2112111100021 its reverse (1200011112112), we get a palindrome (3312122212133).

The spelling of 2112111100021 in words is "two trillion, one hundred twelve billion, one hundred eleven million, one hundred thousand, twenty-one".