421534331 has 4 divisors (see below), whose sum is σ = 421586592. Its totient is φ = 421482072.

The previous prime is 421534277. The next prime is 421534357. The reversal of 421534331 is 133435124.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421534331 is a prime.

It is a super-2 number, since 2×421534331² = 355382384423235122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421534331.

It is not an unprimeable number, because it can be changed into a prime (421534381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11180 + ... + 31113.

It is an arithmetic number, because the mean of its divisors is an integer number (105396648).

Almost surely, 2^421534331 is an apocalyptic number.

421534331 is a deficient number, since it is larger than the sum of its proper divisors (52261).

421534331 is an equidigital number, since it uses as much as digits as its factorization.

421534331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52260.

The product of its digits is 4320, while the sum is 26.

The square root of 421534331 is about 20531.3012495555. The cubic root of 421534331 is about 749.7980677101.

Adding to 421534331 its reverse (133435124), we get a palindrome (554969455).

The spelling of 421534331 in words is "four hundred twenty-one million, five hundred thirty-four thousand, three hundred thirty-one".