641284203508021 has 2 divisors, whose sum is σ = 641284203508022. Its totient is φ = 641284203508020.

The previous prime is 641284203507979. The next prime is 641284203508033. The reversal of 641284203508021 is 120805302482146.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 445798673463025 + 195485530044996 = 21113945^2 + 13981614^2 .

It is a cyclic number.

It is not a de Polignac number, because 641284203508021 - 2²⁵ = 641284169953589 is a prime.

It is a super-2 number, since 2×641284203508021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (641284203508051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320642101754010 + 320642101754011.

It is an arithmetic number, because the mean of its divisors is an integer number (320642101754011).

Almost surely, 2^{641284203508021} is an apocalyptic number.

It is an amenable number.

641284203508021 is a deficient number, since it is larger than the sum of its proper divisors (1).

641284203508021 is an equidigital number, since it uses as much as digits as its factorization.

641284203508021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 641284203508021 in words is "six hundred forty-one trillion, two hundred eighty-four billion, two hundred three million, five hundred eight thousand, twenty-one".