10102012021 has 4 divisors (see below), whose sum is σ = 10202032044. Its totient is φ = 10001992000.

The previous prime is 10102012013. The next prime is 10102012027. The reversal of 10102012021 is 12021020101.

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 7049449521 + 3052562500 = 83961^2 + 55250^2 .

It is a cyclic number.

It is not a de Polignac number, because 10102012021 - 2³ = 10102012013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10102011989 and 10102012007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10102012027) 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, 50009860 + ... + 50010061.

It is an arithmetic number, because the mean of its divisors is an integer number (2550508011).

Almost surely, 2^10102012021 is an apocalyptic number.

It is an amenable number.

10102012021 is a deficient number, since it is larger than the sum of its proper divisors (100020023).

10102012021 is a wasteful number, since it uses less digits than its factorization.

10102012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100020022.

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

Adding to 10102012021 its reverse (12021020101), we get a palindrome (22123032122).

The spelling of 10102012021 in words is "ten billion, one hundred two million, twelve thousand, twenty-one".