421820373529 has 9 divisors (see below), whose sum is σ = 445202947413. Its totient is φ = 399607610652.

The previous prime is 421820373523. The next prime is 421820373539. The reversal of 421820373529 is 925373028124.

The square root of 421820373529 is 649477.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 421820373529 - 2¹⁵ = 421820340761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421820373523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12322972 + ... + 12357154.

It is an arithmetic number, because the mean of its divisors is an integer number (49466994157).

Almost surely, 2^421820373529 is an apocalyptic number.

421820373529 is the 649477-th square number.

421820373529 is the 324739-th centered octagonal number.

It is an amenable number.

421820373529 is a deficient number, since it is larger than the sum of its proper divisors (23382573884).

421820373529 is an frugal number, since it uses more digits than its factorization.

421820373529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68404 (or 34202 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 421820373529 in words is "four hundred twenty-one billion, eight hundred twenty million, three hundred seventy-three thousand, five hundred twenty-nine".