22721117 has 2 divisors, whose sum is σ = 22721118. Its totient is φ = 22721116.

The previous prime is 22721099. The next prime is 22721137. The reversal of 22721117 is 71112722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22477081 + 244036 = 4741^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 22721117 - 2⁶ = 22721053 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 22721092 and 22721101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22721137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11360558 + 11360559.

It is an arithmetic number, because the mean of its divisors is an integer number (11360559).

Almost surely, 2^22721117 is an apocalyptic number.

It is an amenable number.

22721117 is a deficient number, since it is larger than the sum of its proper divisors (1).

22721117 is an equidigital number, since it uses as much as digits as its factorization.

22721117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 392, while the sum is 23.

The square root of 22721117 is about 4766.6672843822. The cubic root of 22721117 is about 283.2325914817.

Adding to 22721117 its reverse (71112722), we get a palindrome (93833839).

The spelling of 22721117 in words is "twenty-two million, seven hundred twenty-one thousand, one hundred seventeen".