10020001020021 has 12 divisors (see below), whose sum is σ = 14826342973260. Its totient is φ = 6517073833920.

The previous prime is 10020001020011. The next prime is 10020001020089. The reversal of 10020001020021 is 12002010002001.

It can be written as a sum of positive squares in 2 ways, for example, as 4158687389796 + 5861313630225 = 2039286^2 + 2421015^2 .

It is not a de Polignac number, because 10020001020021 - 2⁷ = 10020001019893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 10020001019985 and 10020001020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020001020011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13577236786 + ... + 13577237523.

It is an arithmetic number, because the mean of its divisors is an integer number (1235528581105).

Almost surely, 2^{10020001020021} is an apocalyptic number.

It is an amenable number.

10020001020021 is a deficient number, since it is larger than the sum of its proper divisors (4806341953239).

10020001020021 is a wasteful number, since it uses less digits than its factorization.

10020001020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27154474356 (or 27154474353 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 10020001020021 its reverse (12002010002001), we get a palindrome (22022011022022).

The spelling of 10020001020021 in words is "ten trillion, twenty billion, one million, twenty thousand, twenty-one".