111201021120021 has 16 divisors (see below), whose sum is σ = 169449948160128. Its totient is φ = 63543150720000.

The previous prime is 111201021119989. The next prime is 111201021120023. The reversal of 111201021120021 is 120021120102111.

It is a happy number.

It is not a de Polignac number, because 111201021120021 - 2⁵ = 111201021119989 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201021120023) 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, 7324180 + ... + 16614621.

It is an arithmetic number, because the mean of its divisors is an integer number (10590621760008).

Almost surely, 2^{111201021120021} is an apocalyptic number.

It is an amenable number.

111201021120021 is a deficient number, since it is larger than the sum of its proper divisors (58248927040107).

111201021120021 is a wasteful number, since it uses less digits than its factorization.

111201021120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24160012.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111201021120021 its reverse (120021120102111), we get a palindrome (231222141222132).

The spelling of 111201021120021 in words is "one hundred eleven trillion, two hundred one billion, twenty-one million, one hundred twenty thousand, twenty-one".