111211000121 has 16 divisors (see below), whose sum is σ = 122137488144. Its totient is φ = 100626898944.

The previous prime is 111211000073. The next prime is 111211000157. The reversal of 111211000121 is 121000112111.

It can be written as a sum of positive squares in 8 ways, for example, as 1609614400 + 109601385721 = 40120^2 + 331061^2 .

It is not a de Polignac number, because 111211000121 - 2⁶ = 111211000057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111211000181) 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, 682265 + ... + 829401.

It is an arithmetic number, because the mean of its divisors is an integer number (7633593009).

Almost surely, 2^111211000121 is an apocalyptic number.

It is an amenable number.

111211000121 is a deficient number, since it is larger than the sum of its proper divisors (10926488023).

111211000121 is a wasteful number, since it uses less digits than its factorization.

111211000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148300.

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

Adding to 111211000121 its reverse (121000112111), we get a palindrome (232211112232).

The spelling of 111211000121 in words is "one hundred eleven billion, two hundred eleven million, one hundred twenty-one", and thus it is an aban number.