2221313131 has 4 divisors (see below), whose sum is σ = 2251742152. Its totient is φ = 2190884112.

The previous prime is 2221313027. The next prime is 2221313173. The reversal of 2221313131 is 1313131222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2221313131 - 2²⁹ = 1684442219 is a prime.

It is a super-2 number, since 2×2221313131² = 9868464051906046322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221313099 and 2221313108.

It is not an unprimeable number, because it can be changed into a prime (2221373131) 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, 15214401 + ... + 15214546.

It is an arithmetic number, because the mean of its divisors is an integer number (562935538).

Almost surely, 2^2221313131 is an apocalyptic number.

2221313131 is a deficient number, since it is larger than the sum of its proper divisors (30429021).

2221313131 is an equidigital number, since it uses as much as digits as its factorization.

2221313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30429020.

The product of its digits is 216, while the sum is 19.

The square root of 2221313131 is about 47130.8087242305. The cubic root of 2221313131 is about 1304.7779075279. Note that the first 3 decimals are identical.

Adding to 2221313131 its reverse (1313131222), we get a palindrome (3534444353).

It can be divided in two parts, 22213 and 13131, that added together give a square (35344 = 188²).

The spelling of 2221313131 in words is "two billion, two hundred twenty-one million, three hundred thirteen thousand, one hundred thirty-one".