421739842225 has 81 divisors (see below), whose sum is σ = 577786489443. Its totient is φ = 305235440640.

The previous prime is 421739842213. The next prime is 421739842231. The reversal of 421739842225 is 522248937124.

The square root of 421739842225 is 649415.

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

It can be written as a sum of positive squares in 13 ways, for example, as 404789885361 + 16949956864 = 636231^2 + 130192^2 .

It is not a de Polignac number, because 421739842225 - 2¹¹ = 421739840177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 4094561524 + ... + 4094561626.

Almost surely, 2^421739842225 is an apocalyptic number.

421739842225 is the 649415-th square number.

421739842225 is the 324708-th centered octagonal number.

It is an amenable number.

421739842225 is a deficient number, since it is larger than the sum of its proper divisors (156046647218).

421739842225 is an equidigital number, since it uses as much as digits as its factorization.

421739842225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 218 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 49.

Multiplying 421739842225 by its sum of digits (49), we get a square (20665252269025 = 4545905²).

The spelling of 421739842225 in words is "four hundred twenty-one billion, seven hundred thirty-nine million, eight hundred forty-two thousand, two hundred twenty-five".