121220100212111 has 16 divisors (see below), whose sum is σ = 126587493204480. Its totient is φ = 115860793208160.

The previous prime is 121220100211999. The next prime is 121220100212147. The reversal of 121220100212111 is 111212001022121.

It is a cyclic number.

It is not a de Polignac number, because 121220100212111 - 2⁴² = 116822053701007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220100212111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220100212411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1080924680 + ... + 1081036818.

It is an arithmetic number, because the mean of its divisors is an integer number (7911718325280).

Almost surely, 2^{121220100212111} is an apocalyptic number.

121220100212111 is a deficient number, since it is larger than the sum of its proper divisors (5367392992369).

121220100212111 is a wasteful number, since it uses less digits than its factorization.

121220100212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147766.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 121220100212111 its reverse (111212001022121), we get a palindrome (232432101234232).

The spelling of 121220100212111 in words is "one hundred twenty-one trillion, two hundred twenty billion, one hundred million, two hundred twelve thousand, one hundred eleven".