2111111210021 has 8 divisors (see below), whose sum is σ = 2326772993664. Its totient is φ = 1899406523520.

The previous prime is 2111111209981. The next prime is 2111111210027. The reversal of 2111111210021 is 1200121111112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2111111210021 - 2³⁸ = 1836233303077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111111209978 and 2111111210005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111111210027) 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, 989273165 + ... + 989275298.

It is an arithmetic number, because the mean of its divisors is an integer number (290846624208).

Almost surely, 2^{2111111210021} is an apocalyptic number.

It is an amenable number.

2111111210021 is a deficient number, since it is larger than the sum of its proper divisors (215661783643).

2111111210021 is a wasteful number, since it uses less digits than its factorization.

2111111210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978548571.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 2111111210021 its reverse (1200121111112), we get a palindrome (3311232321133).

The spelling of 2111111210021 in words is "two trillion, one hundred eleven billion, one hundred eleven million, two hundred ten thousand, twenty-one".