421540523303213 has 2 divisors, whose sum is σ = 421540523303214. Its totient is φ = 421540523303212.

The previous prime is 421540523303183. The next prime is 421540523303219. The reversal of 421540523303213 is 312303325045124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 377800778661604 + 43739744641609 = 19437098^2 + 6613603^2 .

It is a cyclic number.

It is not a de Polignac number, because 421540523303213 - 2²⁰ = 421540522254637 is a prime.

It is a super-2 number, since 2×421540523303213² (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 (421540523303219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210770261651606 + 210770261651607.

It is an arithmetic number, because the mean of its divisors is an integer number (210770261651607).

Almost surely, 2^{421540523303213} is an apocalyptic number.

It is an amenable number.

421540523303213 is a deficient number, since it is larger than the sum of its proper divisors (1).

421540523303213 is an equidigital number, since it uses as much as digits as its factorization.

421540523303213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 421540523303213 its reverse (312303325045124), we get a palindrome (733843848348337).

The spelling of 421540523303213 in words is "four hundred twenty-one trillion, five hundred forty billion, five hundred twenty-three million, three hundred three thousand, two hundred thirteen".