21314191 has 2 divisors, whose sum is σ = 21314192. Its totient is φ = 21314190.

The previous prime is 21314179. The next prime is 21314203. The reversal of 21314191 is 19141312.

It is a balanced prime because it is at equal distance from previous prime (21314179) and next prime (21314203).

It is a cyclic number.

It is not a de Polignac number, because 21314191 - 2⁹ = 21313679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21314291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10657095 + 10657096.

It is an arithmetic number, because the mean of its divisors is an integer number (10657096).

Almost surely, 2^21314191 is an apocalyptic number.

21314191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21314191 is an equidigital number, since it uses as much as digits as its factorization.

21314191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 22.

The square root of 21314191 is about 4616.7294700903. The cubic root of 21314191 is about 277.2615314626.

The spelling of 21314191 in words is "twenty-one million, three hundred fourteen thousand, one hundred ninety-one".