4205440421 has 16 divisors (see below), whose sum is σ = 5192820864. Its totient is φ = 3316521024.

The previous prime is 4205440403. The next prime is 4205440531. The reversal of 4205440421 is 1240445024.

It is a cyclic number.

It is not a de Polignac number, because 4205440421 - 2⁶ = 4205440357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4205440021) 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, 47330 + ... + 103203.

It is an arithmetic number, because the mean of its divisors is an integer number (324551304).

Almost surely, 2^4205440421 is an apocalyptic number.

It is an amenable number.

4205440421 is a deficient number, since it is larger than the sum of its proper divisors (987380443).

4205440421 is a wasteful number, since it uses less digits than its factorization.

4205440421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150860.

The product of its (nonzero) digits is 5120, while the sum is 26.

The square root of 4205440421 is about 64849.3671595953. The cubic root of 4205440421 is about 1614.1249907681.

Adding to 4205440421 its reverse (1240445024), we get a palindrome (5445885445).

The spelling of 4205440421 in words is "four billion, two hundred five million, four hundred forty thousand, four hundred twenty-one".