2122111021 has 4 divisors (see below), whose sum is σ = 2122440544. Its totient is φ = 2121781500.

The previous prime is 2122110979. The next prime is 2122111027. The reversal of 2122111021 is 1201112212.

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 not a de Polignac number, because 2122111021 - 2⁹ = 2122110509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122110992 and 2122111010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122111027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154905 + ... + 168046.

It is an arithmetic number, because the mean of its divisors is an integer number (530610136).

Almost surely, 2^2122111021 is an apocalyptic number.

It is an amenable number.

2122111021 is a deficient number, since it is larger than the sum of its proper divisors (329523).

2122111021 is an equidigital number, since it uses as much as digits as its factorization.

2122111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329522.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2122111021 is about 46066.3762520995. The cubic root of 2122111021 is about 1285.0579131797.

Adding to 2122111021 its reverse (1201112212), we get a palindrome (3323223233).

The spelling of 2122111021 in words is "two billion, one hundred twenty-two million, one hundred eleven thousand, twenty-one".