427338086821 has 2 divisors, whose sum is σ = 427338086822. Its totient is φ = 427338086820.

The previous prime is 427338086797. The next prime is 427338086843. The reversal of 427338086821 is 128680833724.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 264756557025 + 162581529796 = 514545^2 + 403214^2 .

It is a cyclic number.

It is not a de Polignac number, because 427338086821 - 2⁹ = 427338086309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427338086881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213669043410 + 213669043411.

It is an arithmetic number, because the mean of its divisors is an integer number (213669043411).

Almost surely, 2^427338086821 is an apocalyptic number.

It is an amenable number.

427338086821 is a deficient number, since it is larger than the sum of its proper divisors (1).

427338086821 is an equidigital number, since it uses as much as digits as its factorization.

427338086821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3096576, while the sum is 52.

The spelling of 427338086821 in words is "four hundred twenty-seven billion, three hundred thirty-eight million, eighty-six thousand, eight hundred twenty-one".