21015289092 has 96 divisors (see below), whose sum is σ = 59390247168. Its totient is φ = 5646127104.

The previous prime is 21015289091. The next prime is 21015289111. The reversal of 21015289092 is 29098251012.

It is a self number, because there is not a number n which added to its sum of digits gives 21015289092.

It is not an unprimeable number, because it can be changed into a prime (21015289091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1760488 + ... + 1772384.

It is an arithmetic number, because the mean of its divisors is an integer number (618648408).

Almost surely, 2^21015289092 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 21015289092, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29695123584).

21015289092 is an abundant number, since it is smaller than the sum of its proper divisors (38374958076).

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

21015289092 is a wasteful number, since it uses less digits than its factorization.

21015289092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13165 (or 13163 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The spelling of 21015289092 in words is "twenty-one billion, fifteen million, two hundred eighty-nine thousand, ninety-two".