111201112120021 has 96 divisors (see below), whose sum is σ = 149792663809152. Its totient is φ = 81348323696640.

The previous prime is 111201112120019. The next prime is 111201112120037. The reversal of 111201112120021 is 120021211102111.

It is not a de Polignac number, because 111201112120021 - 2¹ = 111201112120019 is a prime.

It is a super-2 number, since 2×111201112120021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111201112119977 and 111201112120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201112180021) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8204900781 + ... + 8204914333.

It is an arithmetic number, because the mean of its divisors is an integer number (1560340248012).

Almost surely, 2^{111201112120021} is an apocalyptic number.

111201112120021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111201112120021 is a deficient number, since it is larger than the sum of its proper divisors (38591551689131).

111201112120021 is a wasteful number, since it uses less digits than its factorization.

111201112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15779 (or 15772 counting only the distinct ones).

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

Adding to 111201112120021 its reverse (120021211102111), we get a palindrome (231222323222132).

The spelling of 111201112120021 in words is "one hundred eleven trillion, two hundred one billion, one hundred twelve million, one hundred twenty thousand, twenty-one".