421005913 has 2 divisors, whose sum is σ = 421005914. Its totient is φ = 421005912.

The previous prime is 421005881. The next prime is 421005919. The reversal of 421005913 is 319500124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412780489 + 8225424 = 20317^2 + 2868^2 .

It is a cyclic number.

It is not a de Polignac number, because 421005913 - 2⁵ = 421005881 is a prime.

It is not a weakly prime, because it can be changed into another prime (421005919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210502956 + 210502957.

It is an arithmetic number, because the mean of its divisors is an integer number (210502957).

Almost surely, 2^421005913 is an apocalyptic number.

It is an amenable number.

421005913 is a deficient number, since it is larger than the sum of its proper divisors (1).

421005913 is an equidigital number, since it uses as much as digits as its factorization.

421005913 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 421005913 is about 20518.4286191706. The cubic root of 421005913 is about 749.4846314229.

The spelling of 421005913 in words is "four hundred twenty-one million, five thousand, nine hundred thirteen".