202101010021 has 8 divisors (see below), whose sum is σ = 202902951384. Its totient is φ = 201299189760.

The previous prime is 202101009991. The next prime is 202101010079. The reversal of 202101010021 is 120010101202.

202101010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 128817105921 + 73283904100 = 358911^2 + 270710^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 202101010021 - 2⁷ = 202101009893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101010081) 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 7 ways as a sum of consecutive naturals, for example, 4883211 + ... + 4924423.

It is an arithmetic number, because the mean of its divisors is an integer number (25362868923).

Almost surely, 2^202101010021 is an apocalyptic number.

It is an amenable number.

202101010021 is a deficient number, since it is larger than the sum of its proper divisors (801941363).

202101010021 is a wasteful number, since it uses less digits than its factorization.

202101010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60551.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 202101010021 its reverse (120010101202), we get a palindrome (322111111223).

The spelling of 202101010021 in words is "two hundred two billion, one hundred one million, ten thousand, twenty-one".