22421281 has 2 divisors, whose sum is σ = 22421282. Its totient is φ = 22421280.

The previous prime is 22421233. The next prime is 22421291. The reversal of 22421281 is 18212422.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22240656 + 180625 = 4716^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 22421281 - 2²³ = 14032673 is a prime.

It is a super-2 number, since 2×22421281² = 1005427683361922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22421291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11210640 + 11210641.

It is an arithmetic number, because the mean of its divisors is an integer number (11210641).

Almost surely, 2^22421281 is an apocalyptic number.

It is an amenable number.

22421281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22421281 is an equidigital number, since it uses as much as digits as its factorization.

22421281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 512, while the sum is 22.

The square root of 22421281 is about 4735.1115087187. Note that the first 3 decimals coincide. The cubic root of 22421281 is about 281.9811910061.

The spelling of 22421281 in words is "twenty-two million, four hundred twenty-one thousand, two hundred eighty-one".