421240055 has 24 divisors (see below), whose sum is σ = 536533872. Its totient is φ = 317395584.

The previous prime is 421240037. The next prime is 421240069. The reversal of 421240055 is 550042124.

It is a happy number.

It is not a de Polignac number, because 421240055 - 2¹⁰ = 421239031 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421240055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 176027 + ... + 178403.

It is an arithmetic number, because the mean of its divisors is an integer number (22355578).

Almost surely, 2^421240055 is an apocalyptic number.

421240055 is a deficient number, since it is larger than the sum of its proper divisors (115293817).

421240055 is a wasteful number, since it uses less digits than its factorization.

421240055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2495 (or 2472 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 421240055 is about 20524.1334774455. The cubic root of 421240055 is about 749.6235473725.

Adding to 421240055 its reverse (550042124), we get a palindrome (971282179).

The spelling of 421240055 in words is "four hundred twenty-one million, two hundred forty thousand, fifty-five".