202010010021 has 10 divisors (see below), whose sum is σ = 301768039782. Its totient is φ = 134673339960.

The previous prime is 202010009951. The next prime is 202010010043. The reversal of 202010010021 is 120010010202.

It can be written as a sum of positive squares in only one way, i.e., 178244396100 + 23765613921 = 422190^2 + 154161^2 .

It is not a de Polignac number, because 202010010021 - 2²⁵ = 201976455589 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 = 202010009985 and 202010010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202010010421) 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 9 ways as a sum of consecutive naturals, for example, 1246975290 + ... + 1246975451.

Almost surely, 2^202010010021 is an apocalyptic number.

It is an amenable number.

202010010021 is a deficient number, since it is larger than the sum of its proper divisors (99758029761).

202010010021 is an equidigital number, since it uses as much as digits as its factorization.

202010010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2493950753 (or 2493950744 counting only the distinct ones).

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

Adding to 202010010021 its reverse (120010010202), we get a palindrome (322020020223).

The spelling of 202010010021 in words is "two hundred two billion, ten million, ten thousand, twenty-one".