421166225 has 24 divisors (see below), whose sum is σ = 546340032. Its totient is φ = 321464000.

The previous prime is 421166197. The next prime is 421166233. The reversal of 421166225 is 522661124.

It is not a de Polignac number, because 421166225 - 2¹⁰ = 421165201 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 323075 + ... + 324375.

It is an arithmetic number, because the mean of its divisors is an integer number (22764168).

Almost surely, 2^421166225 is an apocalyptic number.

It is an amenable number.

421166225 is a deficient number, since it is larger than the sum of its proper divisors (125173807).

421166225 is a wasteful number, since it uses less digits than its factorization.

421166225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1897 (or 1892 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 421166225 is about 20522.3347843271. The cubic root of 421166225 is about 749.5797497488.

The spelling of 421166225 in words is "four hundred twenty-one million, one hundred sixty-six thousand, two hundred twenty-five".