22201997 has 4 divisors (see below), whose sum is σ = 22211520. Its totient is φ = 22192476.

The previous prime is 22201967. The next prime is 22201999. The reversal of 22201997 is 79910222.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 22201997 - 2¹⁴ = 22185613 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 (22201999) 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, 1358 + ... + 6800.

It is an arithmetic number, because the mean of its divisors is an integer number (5552880).

Almost surely, 2^22201997 is an apocalyptic number.

It is an amenable number.

22201997 is a deficient number, since it is larger than the sum of its proper divisors (9523).

22201997 is an equidigital number, since it uses as much as digits as its factorization.

22201997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 22201997 is about 4711.8995108130. The cubic root of 22201997 is about 281.0589028127.

The spelling of 22201997 in words is "twenty-two million, two hundred one thousand, nine hundred ninety-seven".