10001131221 has 8 divisors (see below), whose sum is σ = 13644954400. Its totient is φ = 6512364432.

The previous prime is 10001131169. The next prime is 10001131237. The reversal of 10001131221 is 12213110001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-10001131221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10001131197 and 10001131206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10001131291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38763946 + ... + 38764203.

It is an arithmetic number, because the mean of its divisors is an integer number (1705619300).

Almost surely, 2^10001131221 is an apocalyptic number.

It is an amenable number.

10001131221 is a deficient number, since it is larger than the sum of its proper divisors (3643823179).

10001131221 is an equidigital number, since it uses as much as digits as its factorization.

10001131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77528195.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 10001131221 its reverse (12213110001), we get a palindrome (22214241222).

The spelling of 10001131221 in words is "ten billion, one million, one hundred thirty-one thousand, two hundred twenty-one".