10201010021 has 4 divisors (see below), whose sum is σ = 10801069452. Its totient is φ = 9600950592.

The previous prime is 10201009991. The next prime is 10201010059. The reversal of 10201010021 is 12001010201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12001010201 = 571 ⋅21017531.

It can be written as a sum of positive squares in 2 ways, for example, as 7618845796 + 2582164225 = 87286^2 + 50815^2 .

It is a cyclic number.

It is not a de Polignac number, because 10201010021 - 2¹⁰ = 10201008997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10201009990 and 10201010008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10201010081) 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, 300029690 + ... + 300029723.

It is an arithmetic number, because the mean of its divisors is an integer number (2700267363).

Almost surely, 2^10201010021 is an apocalyptic number.

It is an amenable number.

10201010021 is a deficient number, since it is larger than the sum of its proper divisors (600059431).

10201010021 is an equidigital number, since it uses as much as digits as its factorization.

10201010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600059430.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10201010021 its reverse (12001010201), we get a palindrome (22202020222).

The spelling of 10201010021 in words is "ten billion, two hundred one million, ten thousand, twenty-one".