403352021 has 2 divisors, whose sum is σ = 403352022. Its totient is φ = 403352020.

The previous prime is 403351967. The next prime is 403352023. The reversal of 403352021 is 120253304.

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., 399000625 + 4351396 = 19975^2 + 2086^2 .

It is a cyclic number.

It is not a de Polignac number, because 403352021 - 2⁶ = 403351957 is a prime.

Together with 403352023, 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 = 403351984 and 403352002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (403352023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201676010 + 201676011.

It is an arithmetic number, because the mean of its divisors is an integer number (201676011).

Almost surely, 2^403352021 is an apocalyptic number.

It is an amenable number.

403352021 is a deficient number, since it is larger than the sum of its proper divisors (1).

403352021 is an equidigital number, since it uses as much as digits as its factorization.

403352021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 403352021 is about 20083.6256935843. The cubic root of 403352021 is about 738.8587356778.

The spelling of 403352021 in words is "four hundred three million, three hundred fifty-two thousand, twenty-one".