21011012192 has 48 divisors (see below), whose sum is σ = 42397683552. Its totient is φ = 10243630080.

The previous prime is 21011012177. The next prime is 21011012273. The reversal of 21011012192 is 29121011012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3351653 + ... + 3357915.

It is an arithmetic number, because the mean of its divisors is an integer number (883285074).

Almost surely, 2^21011012192 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 21011012192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21198841776).

21011012192 is an abundant number, since it is smaller than the sum of its proper divisors (21386671360).

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

21011012192 is a wasteful number, since it uses less digits than its factorization.

21011012192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8871 (or 8863 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 20.

It can be divided in two parts, 21011012 and 192, that multiplied together give a palindrome (4034114304).

The spelling of 21011012192 in words is "twenty-one billion, eleven million, twelve thousand, one hundred ninety-two".