10243231400221 has 4 divisors (see below), whose sum is σ = 10244446645500. Its totient is φ = 10242016154944.

The previous prime is 10243231400219. The next prime is 10243231400239. The reversal of 10243231400221 is 12200413234201.

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 3103273315321 + 7139958084900 = 1761611^2 + 2672070^2 .

It is a cyclic number.

It is not a de Polignac number, because 10243231400221 - 2¹ = 10243231400219 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 (10243231400291) 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, 607609996 + ... + 607626853.

It is an arithmetic number, because the mean of its divisors is an integer number (2561111661375).

Almost surely, 2^{10243231400221} is an apocalyptic number.

It is an amenable number.

10243231400221 is a deficient number, since it is larger than the sum of its proper divisors (1215245279).

10243231400221 is an equidigital number, since it uses as much as digits as its factorization.

10243231400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215245278.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 10243231400221 its reverse (12200413234201), we get a palindrome (22443644634422).

The spelling of 10243231400221 in words is "ten trillion, two hundred forty-three billion, two hundred thirty-one million, four hundred thousand, two hundred twenty-one".