2221397 has 4 divisors (see below), whose sum is σ = 2244396. Its totient is φ = 2198400.

The previous prime is 2221391. The next prime is 2221399. The reversal of 2221397 is 7931222.

2221397 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1739761 + 481636 = 1319^2 + 694^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221397 - 2⁴ = 2221381 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 (2221391) 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, 11354 + ... + 11547.

It is an arithmetic number, because the mean of its divisors is an integer number (561099).

2^2221397 is an apocalyptic number.

It is an amenable number.

2221397 is a deficient number, since it is larger than the sum of its proper divisors (22999).

2221397 is an equidigital number, since it uses as much as digits as its factorization.

2221397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22998.

The product of its digits is 1512, while the sum is 26.

The square root of 2221397 is about 1490.4351713510. The cubic root of 2221397 is about 130.4794328602.

The spelling of 2221397 in words is "two million, two hundred twenty-one thousand, three hundred ninety-seven".