111121021001221 has 32 divisors (see below), whose sum is σ = 138662954754048. Its totient is φ = 86511279061440.

The previous prime is 111121021001129. The next prime is 111121021001251. The reversal of 111121021001221 is 122100120121111.

It is a cyclic number.

It is not a de Polignac number, because 111121021001221 - 2⁷ = 111121021001093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111121021001195 and 111121021001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121021001251) 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, 2567291646 + ... + 2567334928.

It is an arithmetic number, because the mean of its divisors is an integer number (4333217336064).

Almost surely, 2^{111121021001221} is an apocalyptic number.

111121021001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111121021001221 is a deficient number, since it is larger than the sum of its proper divisors (27541933752827).

111121021001221 is a wasteful number, since it uses less digits than its factorization.

111121021001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72001.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 111121021001221 its reverse (122100120121111), we get a palindrome (233221141122332).

The spelling of 111121021001221 in words is "one hundred eleven trillion, one hundred twenty-one billion, twenty-one million, one thousand, two hundred twenty-one".