22118401 has 2 divisors, whose sum is σ = 22118402. Its totient is φ = 22118400.

The previous prime is 22118399. The next prime is 22118449. The reversal of 22118401 is 10481122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20793600 + 1324801 = 4560^2 + 1151^2 .

It is a cyclic number.

It is not a de Polignac number, because 22118401 - 2¹ = 22118399 is a prime.

Together with 22118399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (22118461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11059200 + 11059201.

It is an arithmetic number, because the mean of its divisors is an integer number (11059201).

It is a Proth number, since it is equal to 675 ⋅ 2¹⁵ + 1 and 675 < 2¹⁵.

Almost surely, 2^22118401 is an apocalyptic number.

It is an amenable number.

22118401 is a deficient number, since it is larger than the sum of its proper divisors (1).

22118401 is an equidigital number, since it uses as much as digits as its factorization.

22118401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 22118401 is about 4703.0204124584. The cubic root of 22118401 is about 280.7057070988.

Adding to 22118401 its reverse (10481122), we get a palindrome (32599523).

The spelling of 22118401 in words is "twenty-two million, one hundred eighteen thousand, four hundred one".