121020111022221 has 12 divisors (see below), whose sum is σ = 176141230293600. Its totient is φ = 80064195586440.

The previous prime is 121020111022163. The next prime is 121020111022277. The reversal of 121020111022221 is 122220111020121.

121020111022221 is a `hidden beast` number, since 1 + 210 + 201 + 1 + 10 + 22 + 221 = 666.

It is not a de Polignac number, because 121020111022221 - 2¹¹ = 121020111020173 is a prime.

It is a super-3 number, since 3×121020111022221³ (a number of 43 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121020111022194 and 121020111022203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020111021221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51323201121 + ... + 51323203478.

It is an arithmetic number, because the mean of its divisors is an integer number (14678435857800).

Almost surely, 2^{121020111022221} is an apocalyptic number.

It is an amenable number.

121020111022221 is a deficient number, since it is larger than the sum of its proper divisors (55121119271379).

121020111022221 is a wasteful number, since it uses less digits than its factorization.

121020111022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102646404736 (or 102646404733 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 121020111022221 its reverse (122220111020121), we get a palindrome (243240222042342).

The spelling of 121020111022221 in words is "one hundred twenty-one trillion, twenty billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".