1001020000021 has 16 divisors (see below), whose sum is σ = 1126114954560. Its totient is φ = 884208718080.

The previous prime is 1001020000007. The next prime is 1001020000049. The reversal of 1001020000021 is 1200000201001.

It is a cyclic number.

It is not a de Polignac number, because 1001020000021 - 2⁵ = 1001019999989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001019999959 and 1001020000013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001020000051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14447370 + ... + 14516491.

It is an arithmetic number, because the mean of its divisors is an integer number (70382184660).

Almost surely, 2^{1001020000021} is an apocalyptic number.

It is an amenable number.

1001020000021 is a deficient number, since it is larger than the sum of its proper divisors (125094954539).

1001020000021 is a wasteful number, since it uses less digits than its factorization.

1001020000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28964004.

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

Adding to 1001020000021 its reverse (1200000201001), we get a palindrome (2201020201022).

The spelling of 1001020000021 in words is "one trillion, one billion, twenty million, twenty-one", and thus it is an aban number and an uban number.