21413191 has 2 divisors, whose sum is σ = 21413192. Its totient is φ = 21413190.

The previous prime is 21413179. The next prime is 21413221. The reversal of 21413191 is 19131412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21413191 - 2⁹ = 21412679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21413101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10706595 + 10706596.

It is an arithmetic number, because the mean of its divisors is an integer number (10706596).

Almost surely, 2^21413191 is an apocalyptic number.

21413191 is a deficient number, since it is larger than the sum of its proper divisors (1).

21413191 is an equidigital number, since it uses as much as digits as its factorization.

21413191 is an evil number, because the sum of its binary digits is even.

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

The square root of 21413191 is about 4627.4389245024. The cubic root of 21413191 is about 277.6901426604.

The spelling of 21413191 in words is "twenty-one million, four hundred thirteen thousand, one hundred ninety-one".