214821491 has 2 divisors, whose sum is σ = 214821492. Its totient is φ = 214821490.

The previous prime is 214821487. The next prime is 214821493. The reversal of 214821491 is 194128412.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 214821491 - 2² = 214821487 is a prime.

It is a super-2 number, since 2×214821491² = 92296545990926162, which contains 22 as substring.

Together with 214821493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (214821493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107410745 + 107410746.

It is an arithmetic number, because the mean of its divisors is an integer number (107410746).

Almost surely, 2^214821491 is an apocalyptic number.

214821491 is a deficient number, since it is larger than the sum of its proper divisors (1).

214821491 is an equidigital number, since it uses as much as digits as its factorization.

214821491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 32.

The square root of 214821491 is about 14656.7899282210. The cubic root of 214821491 is about 598.9067973526.

The spelling of 214821491 in words is "two hundred fourteen million, eight hundred twenty-one thousand, four hundred ninety-one".