22001997 has 4 divisors (see below), whose sum is σ = 29336000. Its totient is φ = 14667996.

The previous prime is 22001989. The next prime is 22001999. The reversal of 22001997 is 79910022.

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.

It is not a de Polignac number, because 22001997 - 2³ = 22001989 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 (22001999) 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, 3666997 + ... + 3667002.

It is an arithmetic number, because the mean of its divisors is an integer number (7334000).

Almost surely, 2^22001997 is an apocalyptic number.

It is an amenable number.

22001997 is a deficient number, since it is larger than the sum of its proper divisors (7334003).

22001997 is an equidigital number, since it uses as much as digits as its factorization.

22001997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334002.

The product of its (nonzero) digits is 2268, while the sum is 30.

The square root of 22001997 is about 4690.6286359080. The cubic root of 22001997 is about 280.2124111008.

It can be divided in two parts, 220019 and 97, that added together give a triangular number (220116 = T₆₆₃).

The spelling of 22001997 in words is "twenty-two million, one thousand, nine hundred ninety-seven".