10202240021 has 4 divisors (see below), whose sum is σ = 10205512044. Its totient is φ = 10198968000.

The previous prime is 10202240003. The next prime is 10202240023. The reversal of 10202240021 is 12004220201.

10202240021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12004220201 = 10651 ⋅1127051.

It can be written as a sum of positive squares in 2 ways, for example, as 84897796 + 10117342225 = 9214^2 + 100585^2 .

It is a cyclic number.

It is not a de Polignac number, because 10202240021 - 2¹⁴ = 10202223637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10202239978 and 10202240005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10202240023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1631330 + ... + 1637571.

It is an arithmetic number, because the mean of its divisors is an integer number (2551378011).

Almost surely, 2^10202240021 is an apocalyptic number.

It is an amenable number.

10202240021 is a deficient number, since it is larger than the sum of its proper divisors (3272023).

10202240021 is an equidigital number, since it uses as much as digits as its factorization.

10202240021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3272022.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 10202240021 its reverse (12004220201), we get a palindrome (22206460222).

The spelling of 10202240021 in words is "ten billion, two hundred two million, two hundred forty thousand, twenty-one".