21100020024 has 64 divisors (see below), whose sum is σ = 53879011200. Its totient is φ = 6884152704.

The previous prime is 21100020023. The next prime is 21100020037. The reversal of 21100020024 is 42002000112.

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 = 21100019991 and 21100020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100020023) 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, 210667 + ... + 294245.

It is an arithmetic number, because the mean of its divisors is an integer number (841859550).

Almost surely, 2^21100020024 is an apocalyptic number.

21100020024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21100020024 is an abundant number, since it is smaller than the sum of its proper divisors (32778991176).

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

21100020024 is a wasteful number, since it uses less digits than its factorization.

21100020024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83812 (or 83808 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21100020024 its reverse (42002000112), we get a palindrome (63102020136).

The spelling of 21100020024 in words is "twenty-one billion, one hundred million, twenty thousand, twenty-four".