782213221 has 2 divisors, whose sum is σ = 782213222. Its totient is φ = 782213220.

The previous prime is 782213161. The next prime is 782213251. The reversal of 782213221 is 122312287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 658692225 + 123520996 = 25665^2 + 11114^2 .

It is a cyclic number.

It is not a de Polignac number, because 782213221 - 2¹³ = 782205029 is a prime.

It is a super-2 number, since 2×782213221² = 1223715046214389682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 782213221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (782213251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 391106610 + 391106611.

It is an arithmetic number, because the mean of its divisors is an integer number (391106611).

Almost surely, 2^782213221 is an apocalyptic number.

It is an amenable number.

782213221 is a deficient number, since it is larger than the sum of its proper divisors (1).

782213221 is an equidigital number, since it uses as much as digits as its factorization.

782213221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 782213221 is about 27968.0750320790. The cubic root of 782213221 is about 921.3862297689.

The spelling of 782213221 in words is "seven hundred eighty-two million, two hundred thirteen thousand, two hundred twenty-one".