421540832617 has 4 divisors (see below), whose sum is σ = 421545720976. Its totient is φ = 421535944260.

The previous prime is 421540832567. The next prime is 421540832623. The reversal of 421540832617 is 716238045124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421540832617 is a prime.

It is a super-2 number, since 2×421540832617² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421540832627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2312463 + ... + 2488084.

It is an arithmetic number, because the mean of its divisors is an integer number (105386430244).

Almost surely, 2^421540832617 is an apocalyptic number.

It is an amenable number.

421540832617 is a deficient number, since it is larger than the sum of its proper divisors (4888359).

421540832617 is an equidigital number, since it uses as much as digits as its factorization.

421540832617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4888358.

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 421540832617 in words is "four hundred twenty-one billion, five hundred forty million, eight hundred thirty-two thousand, six hundred seventeen".