2123404221 has 4 divisors (see below), whose sum is σ = 2831205632. Its totient is φ = 1415602812.

The previous prime is 2123404219. The next prime is 2123404253. The reversal of 2123404221 is 1224043212.

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 not a de Polignac number, because 2123404221 - 2¹ = 2123404219 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 (2123404201) 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, 353900701 + ... + 353900706.

It is an arithmetic number, because the mean of its divisors is an integer number (707801408).

Almost surely, 2^2123404221 is an apocalyptic number.

It is an amenable number.

2123404221 is a deficient number, since it is larger than the sum of its proper divisors (707801411).

2123404221 is an equidigital number, since it uses as much as digits as its factorization.

2123404221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707801410.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 2123404221 is about 46080.4103822872. The cubic root of 2123404221 is about 1285.3188953527.

Adding to 2123404221 its reverse (1224043212), we get a palindrome (3347447433).

The spelling of 2123404221 in words is "two billion, one hundred twenty-three million, four hundred four thousand, two hundred twenty-one".