21002100111024 has 80 divisors (see below), whose sum is σ = 56238781440000. Its totient is φ = 6745750679808.

The previous prime is 21002100111023. The next prime is 21002100111029. The reversal of 21002100111024 is 42011100120012.

It is a junction number, because it is equal to n+sod(n) for n = 21002100110994 and 21002100111012.

It is not an unprimeable number, because it can be changed into a prime (21002100111023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14423344 + ... + 15812559.

It is an arithmetic number, because the mean of its divisors is an integer number (702984768000).

Almost surely, 2^{21002100111024} is an apocalyptic number.

21002100111024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21002100111024 is an abundant number, since it is smaller than the sum of its proper divisors (35236681328976).

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

21002100111024 is a wasteful number, since it uses less digits than its factorization.

21002100111024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30236442 (or 30236436 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002100111024 its reverse (42011100120012), we get a palindrome (63013200231036).

The spelling of 21002100111024 in words is "twenty-one trillion, two billion, one hundred million, one hundred eleven thousand, twenty-four".