421233734561 has 4 divisors (see below), whose sum is σ = 421242696624. Its totient is φ = 421224772500.

The previous prime is 421233734549. The next prime is 421233734617. The reversal of 421233734561 is 165437332124.

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-421233734561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421233734461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4410155 + ... + 4504656.

It is an arithmetic number, because the mean of its divisors is an integer number (105310674156).

Almost surely, 2^421233734561 is an apocalyptic number.

It is an amenable number.

421233734561 is a deficient number, since it is larger than the sum of its proper divisors (8962063).

421233734561 is an equidigital number, since it uses as much as digits as its factorization.

421233734561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8962062.

The product of its digits is 362880, while the sum is 41.

The spelling of 421233734561 in words is "four hundred twenty-one billion, two hundred thirty-three million, seven hundred thirty-four thousand, five hundred sixty-one".