213221963 has 2 divisors, whose sum is σ = 213221964. Its totient is φ = 213221962.

The previous prime is 213221959. The next prime is 213222013. The reversal of 213221963 is 369122312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 213221963 - 2² = 213221959 is a prime.

It is not a weakly prime, because it can be changed into another prime (213221903) 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, 106610981 + 106610982.

It is an arithmetic number, because the mean of its divisors is an integer number (106610982).

Almost surely, 2^213221963 is an apocalyptic number.

213221963 is a deficient number, since it is larger than the sum of its proper divisors (1).

213221963 is an equidigital number, since it uses as much as digits as its factorization.

213221963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 29.

The square root of 213221963 is about 14602.1218663590. The cubic root of 213221963 is about 597.4166365376.

The spelling of 213221963 in words is "two hundred thirteen million, two hundred twenty-one thousand, nine hundred sixty-three".