22081397 has 4 divisors (see below), whose sum is σ = 23779980. Its totient is φ = 20382816.

The previous prime is 22081387. The next prime is 22081429. The reversal of 22081397 is 79318022.

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 1957201 + 20124196 = 1399^2 + 4486^2 .

It is a cyclic number.

It is not a de Polignac number, because 22081397 - 2⁶ = 22081333 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 (22081387) 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, 849272 + ... + 849297.

It is an arithmetic number, because the mean of its divisors is an integer number (5944995).

Almost surely, 2^22081397 is an apocalyptic number.

It is an amenable number.

22081397 is a deficient number, since it is larger than the sum of its proper divisors (1698583).

22081397 is a wasteful number, since it uses less digits than its factorization.

22081397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1698582.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 22081397 is about 4699.0846981088. The cubic root of 22081397 is about 280.5490798637.

The spelling of 22081397 in words is "twenty-two million, eighty-one thousand, three hundred ninety-seven".