2201221220121 has 96 divisors (see below), whose sum is σ = 4011008901120. Its totient is φ = 1130008060800.

The previous prime is 2201221220089. The next prime is 2201221220147. The reversal of 2201221220121 is 1210221221022.

It is a happy number.

2201221220121 is a `hidden beast` number, since 2 + 201 + 221 + 220 + 1 + 21 = 666.

It is not a de Polignac number, because 2201221220121 - 2⁵ = 2201221220089 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2201221220094 and 2201221220103.

It is not an unprimeable number, because it can be changed into a prime (2201221220161) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 34158351 + ... + 34222731.

It is an arithmetic number, because the mean of its divisors is an integer number (41781342720).

Almost surely, 2^{2201221220121} is an apocalyptic number.

2201221220121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2201221220121 is a deficient number, since it is larger than the sum of its proper divisors (1809787680999).

2201221220121 is a wasteful number, since it uses less digits than its factorization.

2201221220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64987 (or 64984 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2201221220121 its reverse (1210221221022), we get a palindrome (3411442441143).

Subtracting from 2201221220121 its reverse (1210221221022), we obtain a palindrome (990999999099).

The spelling of 2201221220121 in words is "two trillion, two hundred one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred twenty-one".