21206241666792 has 768 divisors, whose sum is σ = 76191562137600. Its totient is φ = 5176811243520.

The previous prime is 21206241666791. The next prime is 21206241666833. The reversal of 21206241666792 is 29766614260212.

It is not an unprimeable number, because it can be changed into a prime (21206241666791) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 630239713 + ... + 630273359.

It is an arithmetic number, because the mean of its divisors is an integer number (99207763200).

Almost surely, 2^{21206241666792} 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 21206241666792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38095781068800).

21206241666792 is an abundant number, since it is smaller than the sum of its proper divisors (54985320470808).

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

21206241666792 is a wasteful number, since it uses less digits than its factorization.

21206241666792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33846 (or 33839 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 21206241666792 in words is "twenty-one trillion, two hundred six billion, two hundred forty-one million, six hundred sixty-six thousand, seven hundred ninety-two".