111201010121 has 6 divisors (see below), whose sum is σ = 116246047050. Its totient is φ = 106366183088.

The previous prime is 111201010111. The next prime is 111201010171. The reversal of 111201010121 is 121010102111.

It can be written as a sum of positive squares in only one way, i.e., 75631050121 + 35569960000 = 275011^2 + 188600^2 .

It is not a de Polignac number, because 111201010121 - 2³⁰ = 110127268297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111201010111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105104396 + ... + 105105453.

It is an arithmetic number, because the mean of its divisors is an integer number (19374341175).

Almost surely, 2^111201010121 is an apocalyptic number.

It is an amenable number.

111201010121 is a deficient number, since it is larger than the sum of its proper divisors (5045036929).

111201010121 is an equidigital number, since it uses as much as digits as its factorization.

111201010121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210209895 (or 210209872 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 111201010121 its reverse (121010102111), we get a palindrome (232211112232).

The spelling of 111201010121 in words is "one hundred eleven billion, two hundred one million, ten thousand, one hundred twenty-one".