213922817 has 2 divisors, whose sum is σ = 213922818. Its totient is φ = 213922816.

The previous prime is 213922801. The next prime is 213922859. The reversal of 213922817 is 718229312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118352641 + 95570176 = 10879^2 + 9776^2 .

It is a cyclic number.

It is not a de Polignac number, because 213922817 - 2⁴ = 213922801 is a prime.

It is not a weakly prime, because it can be changed into another prime (213922867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106961408 + 106961409.

It is an arithmetic number, because the mean of its divisors is an integer number (106961409).

Almost surely, 2^213922817 is an apocalyptic number.

It is an amenable number.

213922817 is a deficient number, since it is larger than the sum of its proper divisors (1).

213922817 is an equidigital number, since it uses as much as digits as its factorization.

213922817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 213922817 is about 14626.1005397885. The cubic root of 213922817 is about 598.0704840056.

The spelling of 213922817 in words is "two hundred thirteen million, nine hundred twenty-two thousand, eight hundred seventeen".