10001123221 has 4 divisors (see below), whose sum is σ = 10003625632. Its totient is φ = 9998620812.

The previous prime is 10001123201. The next prime is 10001123227. The reversal of 10001123221 is 12232110001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12232110001 = 151 ⋅81007351.

It is a cyclic number.

It is not a de Polignac number, because 10001123221 - 2²⁵ = 9967568789 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 (10001123227) 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, 1245201 + ... + 1253206.

It is an arithmetic number, because the mean of its divisors is an integer number (2500906408).

Almost surely, 2^10001123221 is an apocalyptic number.

It is an amenable number.

10001123221 is a deficient number, since it is larger than the sum of its proper divisors (2502411).

10001123221 is an equidigital number, since it uses as much as digits as its factorization.

10001123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502410.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 10001123221 its reverse (12232110001), we get a palindrome (22233233222).

The spelling of 10001123221 in words is "ten billion, one million, one hundred twenty-three thousand, two hundred twenty-one".