421913 has 2 divisors, whose sum is σ = 421914. Its totient is φ = 421912.

The previous prime is 421907. The next prime is 421943. The reversal of 421913 is 319124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 413449 + 8464 = 643^2 + 92^2 .

It is a cyclic number.

It is not a de Polignac number, because 421913 - 2⁸ = 421657 is a prime.

It is equal to p₃₅₅₃₄ and since 421913 and 35534 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (421943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210956 + 210957.

It is an arithmetic number, because the mean of its divisors is an integer number (210957).

2⁴²¹⁹¹³ is an apocalyptic number.

It is an amenable number.

421913 is a deficient number, since it is larger than the sum of its proper divisors (1).

421913 is an equidigital number, since it uses as much as digits as its factorization.

421913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 421913 is about 649.5483045933. The cubic root of 421913 is about 75.0022517842.

The spelling of 421913 in words is "four hundred twenty-one thousand, nine hundred thirteen".