10121123221 has 16 divisors (see below), whose sum is σ = 11494765440. Its totient is φ = 8827116480.

The previous prime is 10121123203. The next prime is 10121123231. The reversal of 10121123221 is 12232112101.

It is a cyclic number.

It is not a de Polignac number, because 10121123221 - 2¹³ = 10121115029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10121123195 and 10121123204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121123231) 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, 50961 + ... + 151126.

It is an arithmetic number, because the mean of its divisors is an integer number (718422840).

Almost surely, 2^10121123221 is an apocalyptic number.

10121123221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121123221 is a deficient number, since it is larger than the sum of its proper divisors (1373642219).

10121123221 is a wasteful number, since it uses less digits than its factorization.

10121123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202284.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 10121123221 its reverse (12232112101), we get a palindrome (22353235322).

The spelling of 10121123221 in words is "ten billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty-one".