421850521 has 27 divisors (see below), whose sum is σ = 475534101. Its totient is φ = 374138424.

The previous prime is 421850519. The next prime is 421850543. The reversal of 421850521 is 125058124.

421850521 = T₂₈₆ + T₂₈₇ + ... + T₁₃₆₆.

The square root of 421850521 is 20539.

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

It is not a de Polignac number, because 421850521 - 2¹ = 421850519 is a prime.

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 421850521.

It is not an unprimeable number, because it can be changed into a prime (421850591) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 8975520 + ... + 8975566.

Almost surely, 2^421850521 is an apocalyptic number.

421850521 is the 20539-th square number.

421850521 is the 10270-th centered octagonal number.

It is an amenable number.

421850521 is a deficient number, since it is larger than the sum of its proper divisors (53683580).

421850521 is an equidigital number, since it uses as much as digits as its factorization.

421850521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 28.

The cubic root of 421850521 is about 749.9854936453.

The spelling of 421850521 in words is "four hundred twenty-one million, eight hundred fifty thousand, five hundred twenty-one".