2100313221 has 4 divisors (see below), whose sum is σ = 2800417632. Its totient is φ = 1400208812.

The previous prime is 2100313207. The next prime is 2100313223. The reversal of 2100313221 is 1223130012.

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 2100313221 - 2¹¹ = 2100311173 is a prime.

It is a super-2 number, since 2×2100313221² = 8822631252614789682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2100313221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100313223) 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, 350052201 + ... + 350052206.

It is an arithmetic number, because the mean of its divisors is an integer number (700104408).

Almost surely, 2^2100313221 is an apocalyptic number.

It is an amenable number.

2100313221 is a deficient number, since it is larger than the sum of its proper divisors (700104411).

2100313221 is an equidigital number, since it uses as much as digits as its factorization.

2100313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700104410.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2100313221 is about 45829.1743434245. The cubic root of 2100313221 is about 1280.6428291695.

Adding to 2100313221 its reverse (1223130012), we get a palindrome (3323443233).

The spelling of 2100313221 in words is "two billion, one hundred million, three hundred thirteen thousand, two hundred twenty-one".