814719185221 has 2 divisors, whose sum is σ = 814719185222. Its totient is φ = 814719185220.

The previous prime is 814719185197. The next prime is 814719185339. The reversal of 814719185221 is 122581917418.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 707062356900 + 107656828321 = 840870^2 + 328111^2 .

It is a cyclic number.

It is not a de Polignac number, because 814719185221 - 2⁹ = 814719184709 is a prime.

It is a super-4 number, since 4×814719185221⁴ (a number of 49 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (814711185221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407359592610 + 407359592611.

It is an arithmetic number, because the mean of its divisors is an integer number (407359592611).

Almost surely, 2^814719185221 is an apocalyptic number.

It is an amenable number.

814719185221 is a deficient number, since it is larger than the sum of its proper divisors (1).

814719185221 is an equidigital number, since it uses as much as digits as its factorization.

814719185221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 49.

The spelling of 814719185221 in words is "eight hundred fourteen billion, seven hundred nineteen million, one hundred eighty-five thousand, two hundred twenty-one".