4000010021 has 4 divisors (see below), whose sum is σ = 4571440032. Its totient is φ = 3428580012.

The previous prime is 4000010009. The next prime is 4000010041. The reversal of 4000010021 is 1200100004.

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 4000010021 - 2⁶ = 4000009957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4000009990 and 4000010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000010041) 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, 285714995 + ... + 285715008.

It is an arithmetic number, because the mean of its divisors is an integer number (1142860008).

Almost surely, 2^4000010021 is an apocalyptic number.

It is an amenable number.

4000010021 is a deficient number, since it is larger than the sum of its proper divisors (571430011).

4000010021 is an equidigital number, since it uses as much as digits as its factorization.

4000010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571430010.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 4000010021 is about 63245.6324262790. The cubic root of 4000010021 is about 1587.4023775793.

Adding to 4000010021 its reverse (1200100004), we get a palindrome (5200110025).

The spelling of 4000010021 in words is "four billion, ten thousand, twenty-one".