2123211021 has 4 divisors (see below), whose sum is σ = 2830948032. Its totient is φ = 1415474012.

The previous prime is 2123211007. The next prime is 2123211023. The reversal of 2123211021 is 1201123212.

2123211021 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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 2123211021 - 2⁵ = 2123210989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123211023) 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, 353868501 + ... + 353868506.

It is an arithmetic number, because the mean of its divisors is an integer number (707737008).

Almost surely, 2^2123211021 is an apocalyptic number.

It is an amenable number.

2123211021 is a deficient number, since it is larger than the sum of its proper divisors (707737011).

2123211021 is an equidigital number, since it uses as much as digits as its factorization.

2123211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707737010.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 2123211021 is about 46078.3139991037. The cubic root of 2123211021 is about 1285.2799121734.

Adding to 2123211021 its reverse (1201123212), we get a palindrome (3324334233).

The spelling of 2123211021 in words is "two billion, one hundred twenty-three million, two hundred eleven thousand, twenty-one".