1000012000021 has 8 divisors (see below), whose sum is σ = 1009312907544. Its totient is φ = 990719009280.

The previous prime is 1000011999971. The next prime is 1000012000063. The reversal of 1000012000021 is 1200002100001.

1000012000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 40768051921 + 959243948100 = 201911^2 + 979410^2 .

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 1000012000021 - 2⁷ = 1000011999893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000011999968 and 1000012000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000012000081) 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, 1725240 + ... + 2230801.

It is an arithmetic number, because the mean of its divisors is an integer number (126164113443).

Almost surely, 2^{1000012000021} is an apocalyptic number.

It is an amenable number.

1000012000021 is a deficient number, since it is larger than the sum of its proper divisors (9300907523).

1000012000021 is a wasteful number, since it uses less digits than its factorization.

1000012000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958391.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 1000012000021 its reverse (1200002100001), we get a palindrome (2200014100022).

The spelling of 1000012000021 in words is "one trillion, twelve million, twenty-one", and thus it is an aban number and an uban number.