21001112011020 has 96 divisors (see below), whose sum is σ = 62483694549696. Its totient is φ = 5252109721600.

The previous prime is 21001112011013. The next prime is 21001112011039. The reversal of 21001112011020 is 2011021110012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21001112010987 and 21001112011005.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 36349191 + ... + 36922430.

It is an arithmetic number, because the mean of its divisors is an integer number (650871818226).

Almost surely, 2^{21001112011020} is an apocalyptic number.

21001112011020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21001112011020 is an abundant number, since it is smaller than the sum of its proper divisors (41482582538676).

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

21001112011020 is a wasteful number, since it uses less digits than its factorization.

21001112011020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73271931 (or 73271929 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001112011020 its reverse (2011021110012), we get a palindrome (23012133121032).

The spelling of 21001112011020 in words is "twenty-one trillion, one billion, one hundred twelve million, eleven thousand, twenty".