111120112120021 has 16 divisors (see below), whose sum is σ = 113962147060608. Its totient is φ = 108307769377600.

The previous prime is 111120112120019. The next prime is 111120112120051. The reversal of 111120112120021 is 120021211021111.

It is a cyclic number.

It is not a de Polignac number, because 111120112120021 - 2¹ = 111120112120019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111120112119977 and 111120112120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120112120051) 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, 4471225 + ... + 15563806.

It is an arithmetic number, because the mean of its divisors is an integer number (7122634191288).

Almost surely, 2^{111120112120021} is an apocalyptic number.

It is an amenable number.

111120112120021 is a deficient number, since it is larger than the sum of its proper divisors (2842034940587).

111120112120021 is a wasteful number, since it uses less digits than its factorization.

111120112120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20035772.

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

Adding to 111120112120021 its reverse (120021211021111), we get a palindrome (231141323141132).

The spelling of 111120112120021 in words is "one hundred eleven trillion, one hundred twenty billion, one hundred twelve million, one hundred twenty thousand, twenty-one".