421440205 has 16 divisors (see below), whose sum is σ = 518341824. Its totient is φ = 328769280.

The previous prime is 421440179. The next prime is 421440221. The reversal of 421440205 is 502044124.

It is a happy number.

It is not a de Polignac number, because 421440205 - 2¹⁹ = 420915917 is a prime.

It is a super-2 number, since 2×421440205² = 355223692780884050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 173157 + ... + 175573.

It is an arithmetic number, because the mean of its divisors is an integer number (32396364).

Almost surely, 2^421440205 is an apocalyptic number.

It is an amenable number.

421440205 is a deficient number, since it is larger than the sum of its proper divisors (96901619).

421440205 is a wasteful number, since it uses less digits than its factorization.

421440205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 421440205 is about 20529.0088655054. The cubic root of 421440205 is about 749.7422551373.

Adding to 421440205 its reverse (502044124), we get a palindrome (923484329).

The spelling of 421440205 in words is "four hundred twenty-one million, four hundred forty thousand, two hundred five".