21102028092 has 96 divisors (see below), whose sum is σ = 56558779200. Its totient is φ = 6799334400.

The previous prime is 21102028091. The next prime is 21102028111. The reversal of 21102028092 is 29082020112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102028091) by changing a digit.

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, 460792 + ... + 504512.

It is an arithmetic number, because the mean of its divisors is an integer number (589153950).

Almost surely, 2^21102028092 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102028092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28279389600).

21102028092 is an abundant number, since it is smaller than the sum of its proper divisors (35456751108).

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

21102028092 is a wasteful number, since it uses less digits than its factorization.

21102028092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43884 (or 43876 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The spelling of 21102028092 in words is "twenty-one billion, one hundred two million, twenty-eight thousand, ninety-two".