10121122221 has 16 divisors (see below), whose sum is σ = 15424204800. Its totient is φ = 5782920048.

The previous prime is 10121122213. The next prime is 10121122223. The reversal of 10121122221 is 12222112101.

It is not a de Polignac number, because 10121122221 - 2³ = 10121122213 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 10121122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121122223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280320 + ... + 314358.

It is an arithmetic number, because the mean of its divisors is an integer number (964012800).

Almost surely, 2^10121122221 is an apocalyptic number.

It is an amenable number.

10121122221 is a deficient number, since it is larger than the sum of its proper divisors (5303082579).

10121122221 is a wasteful number, since it uses less digits than its factorization.

10121122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48208.

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

Adding to 10121122221 its reverse (12222112101), we get a palindrome (22343234322).

The spelling of 10121122221 in words is "ten billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty-one".