22216451 has 2 divisors, whose sum is σ = 22216452. Its totient is φ = 22216450.

The previous prime is 22216417. The next prime is 22216457. The reversal of 22216451 is 15461222.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22216451 - 2⁶ = 22216387 is a prime.

It is not a weakly prime, because it can be changed into another prime (22216457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11108225 + 11108226.

It is an arithmetic number, because the mean of its divisors is an integer number (11108226).

Almost surely, 2^22216451 is an apocalyptic number.

22216451 is a deficient number, since it is larger than the sum of its proper divisors (1).

22216451 is an equidigital number, since it uses as much as digits as its factorization.

22216451 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 23.

The square root of 22216451 is about 4713.4330376065. The cubic root of 22216451 is about 281.1198814733.

Adding to 22216451 its reverse (15461222), we get a palindrome (37677673).

The spelling of 22216451 in words is "twenty-two million, two hundred sixteen thousand, four hundred fifty-one".