421335503 has 2 divisors, whose sum is σ = 421335504. Its totient is φ = 421335502.

The previous prime is 421335493. The next prime is 421335511. The reversal of 421335503 is 305533124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421335503 - 2¹⁶ = 421269967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421335533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210667751 + 210667752.

It is an arithmetic number, because the mean of its divisors is an integer number (210667752).

Almost surely, 2^421335503 is an apocalyptic number.

421335503 is a deficient number, since it is larger than the sum of its proper divisors (1).

421335503 is an equidigital number, since it uses as much as digits as its factorization.

421335503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 26.

The square root of 421335503 is about 20526.4586083426. The cubic root of 421335503 is about 749.6801616981.

Adding to 421335503 its reverse (305533124), we get a palindrome (726868627).

The spelling of 421335503 in words is "four hundred twenty-one million, three hundred thirty-five thousand, five hundred three".