10243106661421 has 4 divisors (see below), whose sum is σ = 10243590007612. Its totient is φ = 10242623315232.

The previous prime is 10243106661407. The next prime is 10243106661433. The reversal of 10243106661421 is 12416660134201.

10243106661421 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1983058220521 + 8260048440900 = 1408211^2 + 2874030^2 .

It is a cyclic number.

It is not a de Polignac number, because 10243106661421 - 2²⁵ = 10243073106989 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 (10243106661451) 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, 241641306 + ... + 241683691.

It is an arithmetic number, because the mean of its divisors is an integer number (2560897501903).

Almost surely, 2^{10243106661421} is an apocalyptic number.

It is an amenable number.

10243106661421 is a deficient number, since it is larger than the sum of its proper divisors (483346191).

10243106661421 is an equidigital number, since it uses as much as digits as its factorization.

10243106661421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483346190.

The product of its (nonzero) digits is 41472, while the sum is 37.

Adding to 10243106661421 its reverse (12416660134201), we get a palindrome (22659766795622).

The spelling of 10243106661421 in words is "ten trillion, two hundred forty-three billion, one hundred six million, six hundred sixty-one thousand, four hundred twenty-one".