20321414420261 has 2 divisors, whose sum is σ = 20321414420262. Its totient is φ = 20321414420260.

The previous prime is 20321414420183. The next prime is 20321414420443. The reversal of 20321414420261 is 16202441412302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18799213669636 + 1522200750625 = 4335806^2 + 1233775^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321414420261 - 2¹⁸ = 20321414158117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20321414420861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160707210130 + 10160707210131.

It is an arithmetic number, because the mean of its divisors is an integer number (10160707210131).

Almost surely, 2^{20321414420261} is an apocalyptic number.

It is an amenable number.

20321414420261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321414420261 is an equidigital number, since it uses as much as digits as its factorization.

20321414420261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 32.

Adding to 20321414420261 its reverse (16202441412302), we get a palindrome (36523855832563).

The spelling of 20321414420261 in words is "twenty trillion, three hundred twenty-one billion, four hundred fourteen million, four hundred twenty thousand, two hundred sixty-one".