401243322421 has 2 divisors, whose sum is σ = 401243322422. Its totient is φ = 401243322420.

The previous prime is 401243322413. The next prime is 401243322427. The reversal of 401243322421 is 124223342104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396949141521 + 4294180900 = 630039^2 + 65530^2 .

It is a cyclic number.

It is not a de Polignac number, because 401243322421 - 2³ = 401243322413 is a prime.

It is a super-2 number, since 2×401243322421² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 401243322421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401243322427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200621661210 + 200621661211.

It is an arithmetic number, because the mean of its divisors is an integer number (200621661211).

Almost surely, 2^401243322421 is an apocalyptic number.

It is an amenable number.

401243322421 is a deficient number, since it is larger than the sum of its proper divisors (1).

401243322421 is an equidigital number, since it uses as much as digits as its factorization.

401243322421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 401243322421 its reverse (124223342104), we get a palindrome (525466664525).

The spelling of 401243322421 in words is "four hundred one billion, two hundred forty-three million, three hundred twenty-two thousand, four hundred twenty-one".