121201121022221 has 32 divisors (see below), whose sum is σ = 127195048189440. Its totient is φ = 115358425459200.

The previous prime is 121201121022217. The next prime is 121201121022227. The reversal of 121201121022221 is 122220121102121.

It is a cyclic number.

It is not a de Polignac number, because 121201121022221 - 2² = 121201121022217 is a prime.

It is a super-2 number, since 2×121201121022221² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201121022193 and 121201121022202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201121022227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9664384211 + ... + 9664396751.

It is an arithmetic number, because the mean of its divisors is an integer number (3974845255920).

Almost surely, 2^{121201121022221} is an apocalyptic number.

It is an amenable number.

121201121022221 is a deficient number, since it is larger than the sum of its proper divisors (5993927167219).

121201121022221 is a wasteful number, since it uses less digits than its factorization.

121201121022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18677.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 121201121022221 its reverse (122220121102121), we get a palindrome (243421242124342).

The spelling of 121201121022221 in words is "one hundred twenty-one trillion, two hundred one billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".