2111211122021 has 4 divisors (see below), whose sum is σ = 2120044641600. Its totient is φ = 2102377602444.

The previous prime is 2111211121909. The next prime is 2111211122023. The reversal of 2111211122021 is 1202211121112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111211122021 is a prime.

It is a super-2 number, since 2×2111211122021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111211122023) 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, 4416759431 + ... + 4416759908.

It is an arithmetic number, because the mean of its divisors is an integer number (530011160400).

Almost surely, 2^{2111211122021} is an apocalyptic number.

It is an amenable number.

2111211122021 is a deficient number, since it is larger than the sum of its proper divisors (8833519579).

2111211122021 is an equidigital number, since it uses as much as digits as its factorization.

2111211122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8833519578.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2111211122021 its reverse (1202211121112), we get a palindrome (3313422243133).

Subtracting from 2111211122021 its reverse (1202211121112), we obtain a palindrome (909000000909).

The spelling of 2111211122021 in words is "two trillion, one hundred eleven billion, two hundred eleven million, one hundred twenty-two thousand, twenty-one".