21814739 has 2 divisors, whose sum is σ = 21814740. Its totient is φ = 21814738.

The previous prime is 21814733. The next prime is 21814777. The reversal of 21814739 is 93741812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21814739 - 2²⁴ = 5037523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21814699 and 21814708.

It is not a weakly prime, because it can be changed into another prime (21814733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907369 + 10907370.

It is an arithmetic number, because the mean of its divisors is an integer number (10907370).

Almost surely, 2^21814739 is an apocalyptic number.

21814739 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814739 is an equidigital number, since it uses as much as digits as its factorization.

21814739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 35.

The square root of 21814739 is about 4670.6251187609. The cubic root of 21814739 is about 279.4151867112.

The spelling of 21814739 in words is "twenty-one million, eight hundred fourteen thousand, seven hundred thirty-nine".