1010200020021 has 24 divisors (see below), whose sum is σ = 1515105891000. Its totient is φ = 647826383232.

The previous prime is 1010200020007. The next prime is 1010200020041. The reversal of 1010200020021 is 1200200020101.

It can be written as a sum of positive squares in 4 ways, for example, as 124813117521 + 885386902500 = 353289^2 + 940950^2 .

It is not a de Polignac number, because 1010200020021 - 2²⁹ = 1009663149109 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 = 1010200019985 and 1010200020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010200020001) 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 23 ways as a sum of consecutive naturals, for example, 7124026 + ... + 7264443.

It is an arithmetic number, because the mean of its divisors is an integer number (63129412125).

Almost surely, 2^{1010200020021} is an apocalyptic number.

It is an amenable number.

1010200020021 is a deficient number, since it is larger than the sum of its proper divisors (504905870979).

1010200020021 is a wasteful number, since it uses less digits than its factorization.

1010200020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14388773 (or 14388770 counting only the distinct ones).

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

Adding to 1010200020021 its reverse (1200200020101), we get a palindrome (2210400040122).

The spelling of 1010200020021 in words is "one trillion, ten billion, two hundred million, twenty thousand, twenty-one".