402030530021 has 2 divisors, whose sum is σ = 402030530022. Its totient is φ = 402030530020.

The previous prime is 402030529973. The next prime is 402030530023. The reversal of 402030530021 is 120035030204.

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., 401653005121 + 377524900 = 633761^2 + 19430^2 .

It is a cyclic number.

It is not a de Polignac number, because 402030530021 - 2²⁶ = 401963421157 is a prime.

It is a super-3 number, since 3×402030530021³ (a number of 36 digits) contains 333 as substring.

Together with 402030530023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 402030529975 and 402030530002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402030530023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201015265010 + 201015265011.

It is an arithmetic number, because the mean of its divisors is an integer number (201015265011).

Almost surely, 2^402030530021 is an apocalyptic number.

It is an amenable number.

402030530021 is a deficient number, since it is larger than the sum of its proper divisors (1).

402030530021 is an equidigital number, since it uses as much as digits as its factorization.

402030530021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 402030530021 its reverse (120035030204), we get a palindrome (522065560225).

The spelling of 402030530021 in words is "four hundred two billion, thirty million, five hundred thirty thousand, twenty-one".