10221122121 has 24 divisors (see below), whose sum is σ = 16016626080. Its totient is φ = 5780420352.

The previous prime is 10221122117. The next prime is 10221122159. The reversal of 10221122121 is 12122112201.

It is not a de Polignac number, because 10221122121 - 2² = 10221122117 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10221122121.

It is not an unprimeable number, because it can be changed into a prime (10221122111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 344151 + ... + 372668.

It is an arithmetic number, because the mean of its divisors is an integer number (667359420).

Almost surely, 2^10221122121 is an apocalyptic number.

It is an amenable number.

10221122121 is a deficient number, since it is larger than the sum of its proper divisors (5795503959).

10221122121 is an equidigital number, since it uses as much as digits as its factorization.

10221122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716933 (or 716926 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 10221122121 its reverse (12122112201), we get a palindrome (22343234322).

The spelling of 10221122121 in words is "ten billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".