2221913 has 4 divisors (see below), whose sum is σ = 2276148. Its totient is φ = 2167680.

The previous prime is 2221909. The next prime is 2221931. The reversal of 2221913 is 3191222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3191222 = 2 ⋅1595611.

It can be written as a sum of positive squares in 2 ways, for example, as 906304 + 1315609 = 952^2 + 1147^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221913 - 2² = 2221909 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2221943) 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, 27056 + ... + 27137.

It is an arithmetic number, because the mean of its divisors is an integer number (569037).

2^2221913 is an apocalyptic number.

It is an amenable number.

2221913 is a deficient number, since it is larger than the sum of its proper divisors (54235).

2221913 is an equidigital number, since it uses as much as digits as its factorization.

2221913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54234.

The product of its digits is 216, while the sum is 20.

The square root of 2221913 is about 1490.6082651052. The cubic root of 2221913 is about 130.4895349378.

The spelling of 2221913 in words is "two million, two hundred twenty-one thousand, nine hundred thirteen".