10020200021 has 4 divisors (see below), whose sum is σ = 10790984652. Its totient is φ = 9249415392.

The previous prime is 10020199933. The next prime is 10020200039. The reversal of 10020200021 is 12000202001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1663497796 + 8356702225 = 40786^2 + 91415^2 .

It is a cyclic number.

It is not a de Polignac number, because 10020200021 - 2¹⁸ = 10019937877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10020199981 and 10020200008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10020200821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385392296 + ... + 385392321.

It is an arithmetic number, because the mean of its divisors is an integer number (2697746163).

Almost surely, 2^10020200021 is an apocalyptic number.

It is an amenable number.

10020200021 is a deficient number, since it is larger than the sum of its proper divisors (770784631).

10020200021 is an equidigital number, since it uses as much as digits as its factorization.

10020200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770784630.

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

Adding to 10020200021 its reverse (12000202001), we get a palindrome (22020402022).

The spelling of 10020200021 in words is "ten billion, twenty million, two hundred thousand, twenty-one".