2130312221 has 4 divisors (see below), whose sum is σ = 2130432444. Its totient is φ = 2130192000.

The previous prime is 2130312161. The next prime is 2130312227. The reversal of 2130312221 is 1222130312.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2062068100 + 68244121 = 45410^2 + 8261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2130312221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2130312221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2130312227) 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, 27710 + ... + 70911.

It is an arithmetic number, because the mean of its divisors is an integer number (532608111).

Almost surely, 2^2130312221 is an apocalyptic number.

It is an amenable number.

2130312221 is a deficient number, since it is larger than the sum of its proper divisors (120223).

2130312221 is an equidigital number, since it uses as much as digits as its factorization.

2130312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120222.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2130312221 is about 46155.3054480197. The cubic root of 2130312221 is about 1286.7112149183.

Adding to 2130312221 its reverse (1222130312), we get a palindrome (3352442533).

The spelling of 2130312221 in words is "two billion, one hundred thirty million, three hundred twelve thousand, two hundred twenty-one".