402490005221 has 2 divisors, whose sum is σ = 402490005222. Its totient is φ = 402490005220.

The previous prime is 402490005217. The next prime is 402490005289. The reversal of 402490005221 is 122500094204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 373253793025 + 29236212196 = 610945^2 + 170986^2 .

It is a cyclic number.

It is not a de Polignac number, because 402490005221 - 2² = 402490005217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402490005821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201245002610 + 201245002611.

It is an arithmetic number, because the mean of its divisors is an integer number (201245002611).

Almost surely, 2^402490005221 is an apocalyptic number.

It is an amenable number.

402490005221 is a deficient number, since it is larger than the sum of its proper divisors (1).

402490005221 is an equidigital number, since it uses as much as digits as its factorization.

402490005221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 402490005221 its reverse (122500094204), we get a palindrome (524990099425).

The spelling of 402490005221 in words is "four hundred two billion, four hundred ninety million, five thousand, two hundred twenty-one".