213992971 has 2 divisors, whose sum is σ = 213992972. Its totient is φ = 213992970.

The previous prime is 213992939. The next prime is 213993047. The reversal of 213992971 is 179299312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213992971 - 2⁵ = 213992939 is a prime.

It is not a weakly prime, because it can be changed into another prime (213992071) 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, 106996485 + 106996486.

It is an arithmetic number, because the mean of its divisors is an integer number (106996486).

Almost surely, 2^213992971 is an apocalyptic number.

213992971 is a deficient number, since it is larger than the sum of its proper divisors (1).

213992971 is an equidigital number, since it uses as much as digits as its factorization.

213992971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 213992971 is about 14628.4985900809. The cubic root of 213992971 is about 598.1358540796.

The spelling of 213992971 in words is "two hundred thirteen million, nine hundred ninety-two thousand, nine hundred seventy-one".