201101111020 has 48 divisors (see below), whose sum is σ = 428797706400. Its totient is φ = 79208741376.

The previous prime is 201101110979. The next prime is 201101111033. The reversal of 201101111020 is 20111101102.

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 = 201101110988 and 201101111006.

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 15 ways as a sum of consecutive naturals, for example, 782631 + ... + 1007329.

It is an arithmetic number, because the mean of its divisors is an integer number (8933285550).

Almost surely, 2^201101111020 is an apocalyptic number.

201101111020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201101111020 is an abundant number, since it is smaller than the sum of its proper divisors (227696595380).

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

201101111020 is a wasteful number, since it uses less digits than its factorization.

201101111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225394 (or 225392 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 201101111020 its reverse (20111101102), we get a palindrome (221212212122).

The spelling of 201101111020 in words is "two hundred one billion, one hundred one million, one hundred eleven thousand, twenty".