21112102001020 has 48 divisors (see below), whose sum is σ = 45803011258368. Its totient is φ = 8165744009280.

The previous prime is 21112102000993. The next prime is 21112102001069. The reversal of 21112102001020 is 2010020121112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13163154 + ... + 14679673.

It is an arithmetic number, because the mean of its divisors is an integer number (954229401216).

Almost surely, 2^{21112102001020} is an apocalyptic number.

21112102001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112102001020 is an abundant number, since it is smaller than the sum of its proper divisors (24690909257348).

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

21112102001020 is a wasteful number, since it uses less digits than its factorization.

21112102001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27844090 (or 27844088 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21112102001020 its reverse (2010020121112), we get a palindrome (23122122122132).

The spelling of 21112102001020 in words is "twenty-one trillion, one hundred twelve billion, one hundred two million, one thousand, twenty".