121220202112101 has 64 divisors (see below), whose sum is σ = 189131387289600. Its totient is φ = 76522055745600.

The previous prime is 121220202112099. The next prime is 121220202112129. The reversal of 121220202112101 is 101211202022121.

121220202112101 is a `hidden beast` number, since 1 + 2 + 1 + 220 + 20 + 211 + 210 + 1 = 666.

It is not a de Polignac number, because 121220202112101 - 2¹ = 121220202112099 is a prime.

It is a super-3 number, since 3×121220202112101³ (a number of 43 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220202112171) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15687870100 + ... + 15687877826.

It is an arithmetic number, because the mean of its divisors is an integer number (2955177926400).

Almost surely, 2^{121220202112101} is an apocalyptic number.

It is an amenable number.

121220202112101 is a deficient number, since it is larger than the sum of its proper divisors (67911185177499).

121220202112101 is a wasteful number, since it uses less digits than its factorization.

121220202112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19007 (or 19001 counting only the distinct ones).

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

Adding to 121220202112101 its reverse (101211202022121), we get a palindrome (222431404134222).

The spelling of 121220202112101 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred two million, one hundred twelve thousand, one hundred one".