421256117 has 16 divisors (see below), whose sum is σ = 451161600. Its totient is φ = 392454720.

The previous prime is 421256093. The next prime is 421256119. The reversal of 421256117 is 711652124.

It is a cyclic number.

It is not a de Polignac number, because 421256117 - 2⁶ = 421256053 is a prime.

It is a super-2 number, since 2×421256117² = 354913432219835378, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a self number, because there is not a number n which added to its sum of digits gives 421256117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421256119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556103 + ... + 556859.

It is an arithmetic number, because the mean of its divisors is an integer number (28197600).

Almost surely, 2^421256117 is an apocalyptic number.

It is an amenable number.

421256117 is a deficient number, since it is larger than the sum of its proper divisors (29905483).

421256117 is a wasteful number, since it uses less digits than its factorization.

421256117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436.

The product of its digits is 3360, while the sum is 29.

The square root of 421256117 is about 20524.5247691634. The cubic root of 421256117 is about 749.6330750359.

The spelling of 421256117 in words is "four hundred twenty-one million, two hundred fifty-six thousand, one hundred seventeen".