421204332140321 has 2 divisors, whose sum is σ = 421204332140322. Its totient is φ = 421204332140320.

The previous prime is 421204332140239. The next prime is 421204332140329. The reversal of 421204332140321 is 123041233402124.

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., 266496483078400 + 154707849061921 = 16324720^2 + 12438161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421204332140321 is a prime.

It is not a weakly prime, because it can be changed into another prime (421204332140329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210602166070160 + 210602166070161.

It is an arithmetic number, because the mean of its divisors is an integer number (210602166070161).

Almost surely, 2^{421204332140321} is an apocalyptic number.

It is an amenable number.

421204332140321 is a deficient number, since it is larger than the sum of its proper divisors (1).

421204332140321 is an equidigital number, since it uses as much as digits as its factorization.

421204332140321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 421204332140321 its reverse (123041233402124), we get a palindrome (544245565542445).

The spelling of 421204332140321 in words is "four hundred twenty-one trillion, two hundred four billion, three hundred thirty-two million, one hundred forty thousand, three hundred twenty-one".