213321091 has 2 divisors, whose sum is σ = 213321092. Its totient is φ = 213321090.

The previous prime is 213321089. The next prime is 213321107. The reversal of 213321091 is 190123312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213321091 - 2¹ = 213321089 is a prime.

Together with 213321089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (213321001) 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, 106660545 + 106660546.

It is an arithmetic number, because the mean of its divisors is an integer number (106660546).

Almost surely, 2^213321091 is an apocalyptic number.

213321091 is a deficient number, since it is larger than the sum of its proper divisors (1).

213321091 is an equidigital number, since it uses as much as digits as its factorization.

213321091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 213321091 is about 14605.5157731591. The cubic root of 213321091 is about 597.5092028951.

The spelling of 213321091 in words is "two hundred thirteen million, three hundred twenty-one thousand, ninety-one".