455441397821 has 4 divisors (see below), whose sum is σ = 456108223392. Its totient is φ = 454774572252.

The previous prime is 455441397799. The next prime is 455441397839. The reversal of 455441397821 is 128793144554.

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, and also an emirpimes, since its reverse is a distinct semiprime: 128793144554 = 2 ⋅64396572277.

It is a cyclic number.

It is not a de Polignac number, because 455441397821 - 2³⁰ = 454367655997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (455441357821) 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, 333411761 + ... + 333413126.

It is an arithmetic number, because the mean of its divisors is an integer number (114027055848).

Almost surely, 2^455441397821 is an apocalyptic number.

It is an amenable number.

455441397821 is a deficient number, since it is larger than the sum of its proper divisors (666825571).

455441397821 is an equidigital number, since it uses as much as digits as its factorization.

455441397821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666825570.

The product of its digits is 4838400, while the sum is 53.

The spelling of 455441397821 in words is "four hundred fifty-five billion, four hundred forty-one million, three hundred ninety-seven thousand, eight hundred twenty-one".