421751117 has 2 divisors, whose sum is σ = 421751118. Its totient is φ = 421751116.

The previous prime is 421751101. The next prime is 421751173. The reversal of 421751117 is 711157124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 415099876 + 6651241 = 20374^2 + 2579^2 .

It is a cyclic number.

It is not a de Polignac number, because 421751117 - 2⁴ = 421751101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421751117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421751017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210875558 + 210875559.

It is an arithmetic number, because the mean of its divisors is an integer number (210875559).

Almost surely, 2^421751117 is an apocalyptic number.

It is an amenable number.

421751117 is a deficient number, since it is larger than the sum of its proper divisors (1).

421751117 is an equidigital number, since it uses as much as digits as its factorization.

421751117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1960, while the sum is 29.

The square root of 421751117 is about 20536.5799733062. The cubic root of 421751117 is about 749.9265806649.

The spelling of 421751117 in words is "four hundred twenty-one million, seven hundred fifty-one thousand, one hundred seventeen".