420521368831 has 4 divisors (see below), whose sum is σ = 430300935592. Its totient is φ = 410741802072.

The previous prime is 420521368823. The next prime is 420521368879. The reversal of 420521368831 is 138863125024.

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 420521368831 - 2³ = 420521368823 is a prime.

It is a super-2 number, since 2×420521368831² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 9779566717 = 420521368831 / (4 + 2 + 0 + 5 + 2 + 1 + 3 + 6 + 8 + 8 + 3 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420521368031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4889783316 + ... + 4889783401.

It is an arithmetic number, because the mean of its divisors is an integer number (107575233898).

Almost surely, 2^420521368831 is an apocalyptic number.

420521368831 is a deficient number, since it is larger than the sum of its proper divisors (9779566761).

420521368831 is an equidigital number, since it uses as much as digits as its factorization.

420521368831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9779566760.

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 420521368831 in words is "four hundred twenty billion, five hundred twenty-one million, three hundred sixty-eight thousand, eight hundred thirty-one".