921604213 has 2 divisors, whose sum is σ = 921604214. Its totient is φ = 921604212.

The previous prime is 921604183. The next prime is 921604217. The reversal of 921604213 is 312406129.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 897721444 + 23882769 = 29962^2 + 4887^2 .

It is a cyclic number.

It is not a de Polignac number, because 921604213 - 2⁹ = 921603701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (921604217) 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, 460802106 + 460802107.

It is an arithmetic number, because the mean of its divisors is an integer number (460802107).

Almost surely, 2^921604213 is an apocalyptic number.

It is an amenable number.

921604213 is a deficient number, since it is larger than the sum of its proper divisors (1).

921604213 is an equidigital number, since it uses as much as digits as its factorization.

921604213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 921604213 is about 30357.9349264735. The cubic root of 921604213 is about 973.1538021782.

The spelling of 921604213 in words is "nine hundred twenty-one million, six hundred four thousand, two hundred thirteen".