421012161 has 20 divisors (see below), whose sum is σ = 632104000. Its totient is φ = 279253656.

The previous prime is 421012153. The next prime is 421012199. The reversal of 421012161 is 161210124.

It is not a de Polignac number, because 421012161 - 2³ = 421012153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421012061) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3060 + ... + 29178.

It is an arithmetic number, because the mean of its divisors is an integer number (31605200).

Almost surely, 2^421012161 is an apocalyptic number.

It is an amenable number.

421012161 is a deficient number, since it is larger than the sum of its proper divisors (211091839).

421012161 is a wasteful number, since it uses less digits than its factorization.

421012161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26330 (or 26321 counting only the distinct ones).

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

The square root of 421012161 is about 20518.5808719804. The cubic root of 421012161 is about 749.4883390168.

Adding to 421012161 its reverse (161210124), we get a palindrome (582222285).

The spelling of 421012161 in words is "four hundred twenty-one million, twelve thousand, one hundred sixty-one".