201112001020 has 24 divisors (see below), whose sum is σ = 482668802784. Its totient is φ = 68952686016.

The previous prime is 201112001011. The next prime is 201112001063. The reversal of 201112001020 is 20100211102.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 201112000988 and 201112001006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718257007 + ... + 718257286.

It is an arithmetic number, because the mean of its divisors is an integer number (20111200116).

Almost surely, 2^201112001020 is an apocalyptic number.

201112001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201112001020 is an abundant number, since it is smaller than the sum of its proper divisors (281556801764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201112001020 is a wasteful number, since it uses less digits than its factorization.

201112001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436514309 (or 1436514307 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 201112001020 its reverse (20100211102), we get a palindrome (221212212122).

The spelling of 201112001020 in words is "two hundred one billion, one hundred twelve million, one thousand, twenty".