421405401 has 16 divisors (see below), whose sum is σ = 598053888. Its totient is φ = 263020800.

The previous prime is 421405393. The next prime is 421405403. The reversal of 421405401 is 104504124.

It is a happy number.

It is not a de Polignac number, because 421405401 - 2³ = 421405393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421405403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11890 + ... + 31371.

It is an arithmetic number, because the mean of its divisors is an integer number (37378368).

Almost surely, 2^421405401 is an apocalyptic number.

It is an amenable number.

421405401 is a deficient number, since it is larger than the sum of its proper divisors (176648487).

421405401 is a wasteful number, since it uses less digits than its factorization.

421405401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43472.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 421405401 is about 20528.1611694764. The cubic root of 421405401 is about 749.7216157935.

Adding to 421405401 its reverse (104504124), we get a palindrome (525909525).

The spelling of 421405401 in words is "four hundred twenty-one million, four hundred five thousand, four hundred one".