817412421 has 32 divisors (see below), whose sum is σ = 1268269056. Its totient is φ = 458640000.

The previous prime is 817412417. The next prime is 817412423. The reversal of 817412421 is 124214718.

It is not a de Polignac number, because 817412421 - 2² = 817412417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (817412423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 417996 + ... + 419946.

It is an arithmetic number, because the mean of its divisors is an integer number (39633408).

Almost surely, 2^817412421 is an apocalyptic number.

It is an amenable number.

817412421 is a deficient number, since it is larger than the sum of its proper divisors (450856635).

817412421 is a wasteful number, since it uses less digits than its factorization.

817412421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2313.

The product of its digits is 3584, while the sum is 30.

The square root of 817412421 is about 28590.4253378644. The cubic root of 817412421 is about 935.0045929979.

The spelling of 817412421 in words is "eight hundred seventeen million, four hundred twelve thousand, four hundred twenty-one".