10221232121 has 4 divisors (see below), whose sum is σ = 10225791312. Its totient is φ = 10216672932.

The previous prime is 10221232111. The next prime is 10221232159. The reversal of 10221232121 is 12123212201.

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: 12123212201 = 607 ⋅19972343.

It is a cyclic number.

It is not a de Polignac number, because 10221232121 - 2⁶ = 10221232057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10221232121.

It is not an unprimeable number, because it can be changed into a prime (10221232111) 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, 2276231 + ... + 2280716.

It is an arithmetic number, because the mean of its divisors is an integer number (2556447828).

Almost surely, 2^10221232121 is an apocalyptic number.

It is an amenable number.

10221232121 is a deficient number, since it is larger than the sum of its proper divisors (4559191).

10221232121 is an equidigital number, since it uses as much as digits as its factorization.

10221232121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4559190.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 10221232121 its reverse (12123212201), we get a palindrome (22344444322).

The spelling of 10221232121 in words is "ten billion, two hundred twenty-one million, two hundred thirty-two thousand, one hundred twenty-one".