111111020001 has 64 divisors (see below), whose sum is σ = 177805555200. Its totient is φ = 68325285888.

The previous prime is 111111019979. The next prime is 111111020023. The reversal of 111111020001 is 100020111111.

It is an interprime number because it is at equal distance from previous prime (111111019979) and next prime (111111020023).

It is not a de Polignac number, because 111111020001 - 2⁵ = 111111019969 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111111020051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4573755 + ... + 4597983.

It is an arithmetic number, because the mean of its divisors is an integer number (2778211800).

Almost surely, 2^111111020001 is an apocalyptic number.

It is an amenable number.

111111020001 is a deficient number, since it is larger than the sum of its proper divisors (66694535199).

111111020001 is a wasteful number, since it uses less digits than its factorization.

111111020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24455 (or 24449 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 111111020001 its reverse (100020111111), we get a palindrome (211131131112).

The spelling of 111111020001 in words is "one hundred eleven billion, one hundred eleven million, twenty thousand, one".