22013681 has 2 divisors, whose sum is σ = 22013682. Its totient is φ = 22013680.

The previous prime is 22013659. The next prime is 22013683. The reversal of 22013681 is 18631022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 4036081 = 4240^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 22013681 - 2⁶ = 22013617 is a prime.

It is a super-2 number, since 2×22013681² = 969204302339522, which contains 22 as substring.

Together with 22013683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22013683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006840 + 11006841.

It is an arithmetic number, because the mean of its divisors is an integer number (11006841).

Almost surely, 2^22013681 is an apocalyptic number.

It is an amenable number.

22013681 is a deficient number, since it is larger than the sum of its proper divisors (1).

22013681 is an equidigital number, since it uses as much as digits as its factorization.

22013681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 22013681 is about 4691.8739326627. The cubic root of 22013681 is about 280.2620039087.

The spelling of 22013681 in words is "twenty-two million, thirteen thousand, six hundred eighty-one".