4001021201 has 4 divisors (see below), whose sum is σ = 4001240100. Its totient is φ = 4000802304.

The previous prime is 4001021191. The next prime is 4001021207. The reversal of 4001021201 is 1021201004.

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 1967011201 + 2034010000 = 44351^2 + 45100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001021201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001021207) 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, 79256 + ... + 119513.

It is an arithmetic number, because the mean of its divisors is an integer number (1000310025).

Almost surely, 2^4001021201 is an apocalyptic number.

It is an amenable number.

4001021201 is a deficient number, since it is larger than the sum of its proper divisors (218899).

4001021201 is a wasteful number, since it uses less digits than its factorization.

4001021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218898.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 4001021201 is about 63253.6259909264. The cubic root of 4001021201 is about 1587.5361284356.

Adding to 4001021201 its reverse (1021201004), we get a palindrome (5022222205).

The spelling of 4001021201 in words is "four billion, one million, twenty-one thousand, two hundred one".