121021220120111 has 8 divisors (see below), whose sum is σ = 129384194213664. Its totient is φ = 112796477003520.

The previous prime is 121021220120069. The next prime is 121021220120113. The reversal of 121021220120111 is 111021022120121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121021220120111 - 2²² = 121021215925807 is a prime.

It is a super-2 number, since 2×121021220120111² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 121021220120111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021220120113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34557742430 + ... + 34557745931.

It is an arithmetic number, because the mean of its divisors is an integer number (16173024276708).

Almost surely, 2^{121021220120111} is an apocalyptic number.

121021220120111 is a deficient number, since it is larger than the sum of its proper divisors (8362974093553).

121021220120111 is a wasteful number, since it uses less digits than its factorization.

121021220120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69115488481.

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

Adding to 121021220120111 its reverse (111021022120121), we get a palindrome (232042242240232).

The spelling of 121021220120111 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred twenty million, one hundred twenty thousand, one hundred eleven".