421686515819 has 4 divisors (see below), whose sum is σ = 424211584944. Its totient is φ = 419161446696.

The previous prime is 421686515801. The next prime is 421686515821. The reversal of 421686515819 is 918515686124.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 421686515819 - 2¹² = 421686511723 is a prime.

It is a super-2 number, since 2×421686515819² (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 (421686515219) 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, 1262534312 + ... + 1262534645.

It is an arithmetic number, because the mean of its divisors is an integer number (106052896236).

Almost surely, 2^421686515819 is an apocalyptic number.

421686515819 is a deficient number, since it is larger than the sum of its proper divisors (2525069125).

421686515819 is a wasteful number, since it uses less digits than its factorization.

421686515819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2525069124.

The product of its digits is 4147200, while the sum is 56.

The spelling of 421686515819 in words is "four hundred twenty-one billion, six hundred eighty-six million, five hundred fifteen thousand, eight hundred nineteen".