421442401 has 4 divisors (see below), whose sum is σ = 443623600. Its totient is φ = 399261204.

The previous prime is 421442389. The next prime is 421442407. The reversal of 421442401 is 104244124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421442401 - 2¹⁷ = 421311329 is a prime.

It is a super-2 number, since 2×421442401² = 355227394721289602, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421442407) 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, 11090571 + ... + 11090608.

It is an arithmetic number, because the mean of its divisors is an integer number (110905900).

Almost surely, 2^421442401 is an apocalyptic number.

It is an amenable number.

421442401 is a deficient number, since it is larger than the sum of its proper divisors (22181199).

421442401 is a wasteful number, since it uses less digits than its factorization.

421442401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22181198.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 421442401 is about 20529.0623507261. The cubic root of 421442401 is about 749.7435573633.

Adding to 421442401 its reverse (104244124), we get a palindrome (525686525).

The spelling of 421442401 in words is "four hundred twenty-one million, four hundred forty-two thousand, four hundred one".