10221220121 has 24 divisors (see below), whose sum is σ = 12145104000. Its totient is φ = 8574388704.

The previous prime is 10221220117. The next prime is 10221220123. The reversal of 10221220121 is 12102212201.

It is not a de Polignac number, because 10221220121 - 2² = 10221220117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 10221220096 and 10221220105.

It is not an unprimeable number, because it can be changed into a prime (10221220123) 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, 654320 + ... + 669758.

It is an arithmetic number, because the mean of its divisors is an integer number (506046000).

Almost surely, 2^10221220121 is an apocalyptic number.

It is an amenable number.

10221220121 is a deficient number, since it is larger than the sum of its proper divisors (1923883879).

10221220121 is a wasteful number, since it uses less digits than its factorization.

10221220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15741 (or 15734 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10221220121 its reverse (12102212201), we get a palindrome (22323432322).

The spelling of 10221220121 in words is "ten billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".