4055400221 has 4 divisors (see below), whose sum is σ = 4056052572. Its totient is φ = 4054747872.

The previous prime is 4055400211. The next prime is 4055400229. The reversal of 4055400221 is 1220045504.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2917080100 + 1138320121 = 54010^2 + 33739^2 .

It is a cyclic number.

It is not a de Polignac number, because 4055400221 - 2¹⁴ = 4055383837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4055400229) 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, 316760 + ... + 329313.

It is an arithmetic number, because the mean of its divisors is an integer number (1014013143).

Almost surely, 2^4055400221 is an apocalyptic number.

It is an amenable number.

4055400221 is a deficient number, since it is larger than the sum of its proper divisors (652351).

4055400221 is an equidigital number, since it uses as much as digits as its factorization.

4055400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652350.

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

The square root of 4055400221 is about 63682.0243161286. The cubic root of 4055400221 is about 1594.6960071590.

Adding to 4055400221 its reverse (1220045504), we get a palindrome (5275445725).

The spelling of 4055400221 in words is "four billion, fifty-five million, four hundred thousand, two hundred twenty-one".