402040330421 has 2 divisors, whose sum is σ = 402040330422. Its totient is φ = 402040330420.

The previous prime is 402040330361. The next prime is 402040330463. The reversal of 402040330421 is 124033040204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219272110225 + 182768220196 = 468265^2 + 427514^2 .

It is a cyclic number.

It is not a de Polignac number, because 402040330421 - 2⁶ = 402040330357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402040330481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201020165210 + 201020165211.

It is an arithmetic number, because the mean of its divisors is an integer number (201020165211).

Almost surely, 2^402040330421 is an apocalyptic number.

It is an amenable number.

402040330421 is a deficient number, since it is larger than the sum of its proper divisors (1).

402040330421 is an equidigital number, since it uses as much as digits as its factorization.

402040330421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 402040330421 its reverse (124033040204), we get a palindrome (526073370625).

The spelling of 402040330421 in words is "four hundred two billion, forty million, three hundred thirty thousand, four hundred twenty-one".