476721863507221 has 2 divisors, whose sum is σ = 476721863507222. Its totient is φ = 476721863507220.

The previous prime is 476721863507191. The next prime is 476721863507231. The reversal of 476721863507221 is 122705368127674.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 468809710256196 + 7912153251025 = 21652014^2 + 2812855^2 .

It is a cyclic number.

It is not a de Polignac number, because 476721863507221 - 2¹³ = 476721863499029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 476721863507221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (476721863507231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 238360931753610 + 238360931753611.

It is an arithmetic number, because the mean of its divisors is an integer number (238360931753611).

Almost surely, 2^{476721863507221} is an apocalyptic number.

It is an amenable number.

476721863507221 is a deficient number, since it is larger than the sum of its proper divisors (1).

476721863507221 is an equidigital number, since it uses as much as digits as its factorization.

476721863507221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47416320, while the sum is 61.

The spelling of 476721863507221 in words is "four hundred seventy-six trillion, seven hundred twenty-one billion, eight hundred sixty-three million, five hundred seven thousand, two hundred twenty-one".