21814073 has 2 divisors, whose sum is σ = 21814074. Its totient is φ = 21814072.

The previous prime is 21814069. The next prime is 21814087. The reversal of 21814073 is 37041812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21086464 + 727609 = 4592^2 + 853^2 .

It is a cyclic number.

It is not a de Polignac number, because 21814073 - 2² = 21814069 is a prime.

It is not a weakly prime, because it can be changed into another prime (21813073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907036 + 10907037.

It is an arithmetic number, because the mean of its divisors is an integer number (10907037).

Almost surely, 2^21814073 is an apocalyptic number.

It is an amenable number.

21814073 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814073 is an equidigital number, since it uses as much as digits as its factorization.

21814073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21814073 is about 4670.5538215505. The cubic root of 21814073 is about 279.4123431841.

Adding to 21814073 its reverse (37041812), we get a palindrome (58855885).

The spelling of 21814073 in words is "twenty-one million, eight hundred fourteen thousand, seventy-three".