22266421 has 2 divisors, whose sum is σ = 22266422. Its totient is φ = 22266420.

The previous prime is 22266407. The next prime is 22266443. The reversal of 22266421 is 12466222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22193521 + 72900 = 4711^2 + 270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22266421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22266521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11133210 + 11133211.

It is an arithmetic number, because the mean of its divisors is an integer number (11133211).

Almost surely, 2^22266421 is an apocalyptic number.

It is an amenable number.

22266421 is a deficient number, since it is larger than the sum of its proper divisors (1).

22266421 is an equidigital number, since it uses as much as digits as its factorization.

22266421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 25.

The square root of 22266421 is about 4718.7308675109. The cubic root of 22266421 is about 281.3304917929.

The spelling of 22266421 in words is "twenty-two million, two hundred sixty-six thousand, four hundred twenty-one".