421210161 has 6 divisors (see below), whose sum is σ = 608414690. Its totient is φ = 280806768.

The previous prime is 421210147. The next prime is 421210169. The reversal of 421210161 is 161012124.

It can be written as a sum of positive squares in only one way, i.e., 409819536 + 11390625 = 20244^2 + 3375^2 .

It is not a de Polignac number, because 421210161 - 2⁵ = 421210129 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (421210169) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23400556 + ... + 23400573.

Almost surely, 2^421210161 is an apocalyptic number.

It is an amenable number.

421210161 is a deficient number, since it is larger than the sum of its proper divisors (187204529).

421210161 is a wasteful number, since it uses less digits than its factorization.

421210161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46801135 (or 46801132 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 421210161 is about 20523.4051999175. The cubic root of 421210161 is about 749.6058141930.

Adding to 421210161 its reverse (161012124), we get a palindrome (582222285).

The spelling of 421210161 in words is "four hundred twenty-one million, two hundred ten thousand, one hundred sixty-one".