851270078221 has 2 divisors, whose sum is σ = 851270078222. Its totient is φ = 851270078220.

The previous prime is 851270078173. The next prime is 851270078291. The reversal of 851270078221 is 122870072158.

851270078221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 840313222596 + 10956855625 = 916686^2 + 104675^2 .

It is a cyclic number.

It is not a de Polignac number, because 851270078221 - 2¹⁵ = 851270045453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851270078291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425635039110 + 425635039111.

It is an arithmetic number, because the mean of its divisors is an integer number (425635039111).

Almost surely, 2^851270078221 is an apocalyptic number.

It is an amenable number.

851270078221 is a deficient number, since it is larger than the sum of its proper divisors (1).

851270078221 is an equidigital number, since it uses as much as digits as its factorization.

851270078221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 851270078221 in words is "eight hundred fifty-one billion, two hundred seventy million, seventy-eight thousand, two hundred twenty-one".