2221357 has 4 divisors (see below), whose sum is σ = 2238976. Its totient is φ = 2203740.

The previous prime is 2221343. The next prime is 2221379. The reversal of 2221357 is 7531222.

2221357 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7531222 = 2 ⋅3765611.

It is a cyclic number.

It is not a de Polignac number, because 2221357 - 2⁷ = 2221229 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 (2221657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8619 + ... + 8872.

It is an arithmetic number, because the mean of its divisors is an integer number (559744).

2^2221357 is an apocalyptic number.

It is an amenable number.

2221357 is a deficient number, since it is larger than the sum of its proper divisors (17619).

2221357 is a wasteful number, since it uses less digits than its factorization.

2221357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17618.

The product of its digits is 840, while the sum is 22.

The square root of 2221357 is about 1490.4217523909. The cubic root of 2221357 is about 130.4786496881.

Adding to 2221357 its reverse (7531222), we get a palindrome (9752579).

The spelling of 2221357 in words is "two million, two hundred twenty-one thousand, three hundred fifty-seven".