827862765421 has 2 divisors, whose sum is σ = 827862765422. Its totient is φ = 827862765420.

The previous prime is 827862765391. The next prime is 827862765503. The reversal of 827862765421 is 124567268728.

827862765421 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., 559317015625 + 268545749796 = 747875^2 + 518214^2 .

It is a cyclic number.

It is not a de Polignac number, because 827862765421 - 2⁹ = 827862764909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827862760421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413931382710 + 413931382711.

It is an arithmetic number, because the mean of its divisors is an integer number (413931382711).

Almost surely, 2^827862765421 is an apocalyptic number.

It is an amenable number.

827862765421 is a deficient number, since it is larger than the sum of its proper divisors (1).

827862765421 is an equidigital number, since it uses as much as digits as its factorization.

827862765421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18063360, while the sum is 58.

The spelling of 827862765421 in words is "eight hundred twenty-seven billion, eight hundred sixty-two million, seven hundred sixty-five thousand, four hundred twenty-one".