22013281 has 2 divisors, whose sum is σ = 22013282. Its totient is φ = 22013280.

The previous prime is 22013273. The next prime is 22013339. The reversal of 22013281 is 18231022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19501056 + 2512225 = 4416^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013281 - 2³ = 22013273 is a prime.

It is a super-2 number, since 2×22013281² = 969169080769922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22013221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006640 + 11006641.

It is an arithmetic number, because the mean of its divisors is an integer number (11006641).

Almost surely, 2^22013281 is an apocalyptic number.

It is an amenable number.

22013281 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013281 is an equidigital number, since it uses as much as digits as its factorization.

22013281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 22013281 is about 4691.8313055778. The cubic root of 22013281 is about 280.2603063965.

The spelling of 22013281 in words is "twenty-two million, thirteen thousand, two hundred eighty-one".