421006361 has 4 divisors (see below), whose sum is σ = 421049652. Its totient is φ = 420963072.

The previous prime is 421006331. The next prime is 421006367. The reversal of 421006361 is 163600124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 122235136 + 298771225 = 11056^2 + 17285^2 .

It is a cyclic number.

It is not a de Polignac number, because 421006361 - 2⁶ = 421006297 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 (421006367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 29021.

It is an arithmetic number, because the mean of its divisors is an integer number (105262413).

Almost surely, 2^421006361 is an apocalyptic number.

It is an amenable number.

421006361 is a deficient number, since it is larger than the sum of its proper divisors (43291).

421006361 is a wasteful number, since it uses less digits than its factorization.

421006361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43290.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 421006361 is about 20518.4395361831. The cubic root of 421006361 is about 749.4848972695.

Adding to 421006361 its reverse (163600124), we get a palindrome (584606485).

It can be divided in two parts, 4210063 and 61, that added together give a palindrome (4210124).

The spelling of 421006361 in words is "four hundred twenty-one million, six thousand, three hundred sixty-one".