201111100121020 has 24 divisors (see below), whose sum is σ = 425416035152304. Its totient is φ = 79857254353536.

The previous prime is 201111100120961. The next prime is 201111100121033. The reversal of 201111100121020 is 20121001111102.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36699103122 + ... + 36699108601.

It is an arithmetic number, because the mean of its divisors is an integer number (17725668131346).

Almost surely, 2^{201111100121020} is an apocalyptic number.

201111100121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

201111100121020 is an abundant number, since it is smaller than the sum of its proper divisors (224304935031284).

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

201111100121020 is a wasteful number, since it uses less digits than its factorization.

201111100121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73398211869 (or 73398211867 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 201111100121020 its reverse (20121001111102), we get a palindrome (221232101232122).

The spelling of 201111100121020 in words is "two hundred one trillion, one hundred eleven billion, one hundred million, one hundred twenty-one thousand, twenty".