111000020121 has 24 divisors (see below), whose sum is σ = 164041117760. Its totient is φ = 72304812000.

The previous prime is 111000020077. The next prime is 111000020123. The reversal of 111000020121 is 121020000111.

It is a happy number.

It is not a de Polignac number, because 111000020121 - 2⁶ = 111000020057 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111000020123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 586591 + ... + 752388.

Almost surely, 2^111000020121 is an apocalyptic number.

It is an amenable number.

111000020121 is a deficient number, since it is larger than the sum of its proper divisors (53041097639).

111000020121 is a wasteful number, since it uses less digits than its factorization.

111000020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339197 (or 1339194 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 111000020121 its reverse (121020000111), we get a palindrome (232020020232).

The spelling of 111000020121 in words is "one hundred eleven billion, twenty thousand, one hundred twenty-one".