10131203221 has 4 divisors (see below), whose sum is σ = 10133194444. Its totient is φ = 10129212000.

The previous prime is 10131203219. The next prime is 10131203267. The reversal of 10131203221 is 12230213101.

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 588062500 + 9543140721 = 24250^2 + 97689^2 .

It is a cyclic number.

It is not a de Polignac number, because 10131203221 - 2¹ = 10131203219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10131203195 and 10131203204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10131203281) 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, 987960 + ... + 998161.

It is an arithmetic number, because the mean of its divisors is an integer number (2533298611).

Almost surely, 2^10131203221 is an apocalyptic number.

It is an amenable number.

10131203221 is a deficient number, since it is larger than the sum of its proper divisors (1991223).

10131203221 is an equidigital number, since it uses as much as digits as its factorization.

10131203221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991222.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 10131203221 its reverse (12230213101), we get a palindrome (22361416322).

The spelling of 10131203221 in words is "ten billion, one hundred thirty-one million, two hundred three thousand, two hundred twenty-one".