4000012021 has 8 divisors (see below), whose sum is σ = 4249780920. Its totient is φ = 3757699008.

The previous prime is 4000012019. The next prime is 4000012067. The reversal of 4000012021 is 1202100004.

It can be written as a sum of positive squares in 4 ways, for example, as 2549240100 + 1450771921 = 50490^2 + 38089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4000012021 - 2¹ = 4000012019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000011989 and 4000012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000012721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1862866 + ... + 1865011.

It is an arithmetic number, because the mean of its divisors is an integer number (531222615).

Almost surely, 2^4000012021 is an apocalyptic number.

It is an amenable number.

4000012021 is a deficient number, since it is larger than the sum of its proper divisors (249768899).

4000012021 is a wasteful number, since it uses less digits than its factorization.

4000012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727943.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 4000012021 is about 63245.6482376456. The cubic root of 4000012021 is about 1587.4026421456.

Adding to 4000012021 its reverse (1202100004), we get a palindrome (5202112025).

The spelling of 4000012021 in words is "four billion, twelve thousand, twenty-one".