421405101 has 12 divisors (see below), whose sum is σ = 655519228. Its totient is φ = 259326144.

The previous prime is 421405097. The next prime is 421405109. The reversal of 421405101 is 101504124.

It can be written as a sum of positive squares in 2 ways, for example, as 45239076 + 376166025 = 6726^2 + 19395^2 .

It is not a de Polignac number, because 421405101 - 2² = 421405097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421405109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1800760 + ... + 1800993.

Almost surely, 2^421405101 is an apocalyptic number.

It is an amenable number.

421405101 is a deficient number, since it is larger than the sum of its proper divisors (234114127).

421405101 is a wasteful number, since it uses less digits than its factorization.

421405101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601772 (or 3601769 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 421405101 is about 20528.1538624397. The cubic root of 421405101 is about 749.7214378837.

Adding to 421405101 its reverse (101504124), we get a palindrome (522909225).

The spelling of 421405101 in words is "four hundred twenty-one million, four hundred five thousand, one hundred one".