21814087 has 2 divisors, whose sum is σ = 21814088. Its totient is φ = 21814086.

The previous prime is 21814073. The next prime is 21814123. The reversal of 21814087 is 78041812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21814087 - 2¹¹ = 21812039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21814187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10907043 + 10907044.

It is an arithmetic number, because the mean of its divisors is an integer number (10907044).

Almost surely, 2^21814087 is an apocalyptic number.

21814087 is a deficient number, since it is larger than the sum of its proper divisors (1).

21814087 is an equidigital number, since it uses as much as digits as its factorization.

21814087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 21814087 is about 4670.5553203019. Note that the first 3 decimals coincide. The cubic root of 21814087 is about 279.4124029585.

Adding to 21814087 its reverse (78041812), we get a palindrome (99855899).

The spelling of 21814087 in words is "twenty-one million, eight hundred fourteen thousand, eighty-seven".