221062813 has 2 divisors, whose sum is σ = 221062814. Its totient is φ = 221062812.

The previous prime is 221062783. The next prime is 221062837. The reversal of 221062813 is 318260122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158684409 + 62378404 = 12597^2 + 7898^2 .

It is a cyclic number.

It is not a de Polignac number, because 221062813 - 2⁹ = 221062301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221062873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110531406 + 110531407.

It is an arithmetic number, because the mean of its divisors is an integer number (110531407).

Almost surely, 2^221062813 is an apocalyptic number.

It is an amenable number.

221062813 is a deficient number, since it is larger than the sum of its proper divisors (1).

221062813 is an equidigital number, since it uses as much as digits as its factorization.

221062813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 221062813 is about 14868.1812270365. The cubic root of 221062813 is about 604.6516337916.

The spelling of 221062813 in words is "two hundred twenty-one million, sixty-two thousand, eight hundred thirteen".