4000124221 has 4 divisors (see below), whose sum is σ = 4000521312. Its totient is φ = 3999727132.

The previous prime is 4000124213. The next prime is 4000124237. The reversal of 4000124221 is 1224210004.

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 4000124221 - 2³ = 4000124213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000124195 and 4000124204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000124201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183031 + ... + 203716.

It is an arithmetic number, because the mean of its divisors is an integer number (1000130328).

Almost surely, 2^4000124221 is an apocalyptic number.

It is an amenable number.

4000124221 is a deficient number, since it is larger than the sum of its proper divisors (397091).

4000124221 is a wasteful number, since it uses less digits than its factorization.

4000124221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397090.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 4000124221 is about 63246.5352489763. The cubic root of 4000124221 is about 1587.4174841769.

Adding to 4000124221 its reverse (1224210004), we get a palindrome (5224334225).

The spelling of 4000124221 in words is "four billion, one hundred twenty-four thousand, two hundred twenty-one".