21414091 has 2 divisors, whose sum is σ = 21414092. Its totient is φ = 21414090.

The previous prime is 21414089. The next prime is 21414103. The reversal of 21414091 is 19041412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21414091 - 2¹ = 21414089 is a prime.

Together with 21414089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21414391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10707045 + 10707046.

It is an arithmetic number, because the mean of its divisors is an integer number (10707046).

Almost surely, 2^21414091 is an apocalyptic number.

21414091 is a deficient number, since it is larger than the sum of its proper divisors (1).

21414091 is an equidigital number, since it uses as much as digits as its factorization.

21414091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21414091 is about 4627.5361694967. The cubic root of 21414091 is about 277.6940330603.

The spelling of 21414091 in words is "twenty-one million, four hundred fourteen thousand, ninety-one".