402223210421 has 2 divisors, whose sum is σ = 402223210422. Its totient is φ = 402223210420.

The previous prime is 402223210373. The next prime is 402223210429. The reversal of 402223210421 is 124012322204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 348943029796 + 53280180625 = 590714^2 + 230825^2 .

It is a cyclic number.

It is not a de Polignac number, because 402223210421 - 2³⁰ = 401149468597 is a prime.

It is a super-2 number, since 2×402223210421² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402223210429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201111605210 + 201111605211.

It is an arithmetic number, because the mean of its divisors is an integer number (201111605211).

Almost surely, 2^402223210421 is an apocalyptic number.

It is an amenable number.

402223210421 is a deficient number, since it is larger than the sum of its proper divisors (1).

402223210421 is an equidigital number, since it uses as much as digits as its factorization.

402223210421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 402223210421 its reverse (124012322204), we get a palindrome (526235532625).

The spelling of 402223210421 in words is "four hundred two billion, two hundred twenty-three million, two hundred ten thousand, four hundred twenty-one".