22217957 has 4 divisors (see below), whose sum is σ = 22241676. Its totient is φ = 22194240.

The previous prime is 22217927. The next prime is 22217983. The reversal of 22217957 is 75971222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 75971222 = 2 ⋅37985611.

It can be written as a sum of positive squares in 2 ways, for example, as 11498881 + 10719076 = 3391^2 + 3274^2 .

It is a cyclic number.

It is not a de Polignac number, because 22217957 - 2¹² = 22213861 is a prime.

It is a super-2 number, since 2×22217957² = 987275226507698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22217927) 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, 10394 + ... + 12347.

It is an arithmetic number, because the mean of its divisors is an integer number (5560419).

Almost surely, 2^22217957 is an apocalyptic number.

It is an amenable number.

22217957 is a deficient number, since it is larger than the sum of its proper divisors (23719).

22217957 is an equidigital number, since it uses as much as digits as its factorization.

22217957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23718.

The product of its digits is 17640, while the sum is 35.

The square root of 22217957 is about 4713.5927910671. The cubic root of 22217957 is about 281.1262334776.

The spelling of 22217957 in words is "twenty-two million, two hundred seventeen thousand, nine hundred fifty-seven".