2021211113021 has 4 divisors (see below), whose sum is σ = 2023429786944. Its totient is φ = 2018992439100.

The previous prime is 2021211113011. The next prime is 2021211113029. The reversal of 2021211113021 is 1203111121202.

It is a happy number.

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-2021211113021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021211113029) 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, 1109335595 + ... + 1109337416.

It is an arithmetic number, because the mean of its divisors is an integer number (505857446736).

Almost surely, 2^{2021211113021} is an apocalyptic number.

It is an amenable number.

2021211113021 is a deficient number, since it is larger than the sum of its proper divisors (2218673923).

2021211113021 is an equidigital number, since it uses as much as digits as its factorization.

2021211113021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218673922.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2021211113021 its reverse (1203111121202), we get a palindrome (3224322234223).

The spelling of 2021211113021 in words is "two trillion, twenty-one billion, two hundred eleven million, one hundred thirteen thousand, twenty-one".