21037945317792 has 192 divisors, whose sum is σ = 60698487548160. Its totient is φ = 6340670668800.

The previous prime is 21037945317761. The next prime is 21037945317799. The reversal of 21037945317792 is 29771354973012.

It is not an unprimeable number, because it can be changed into a prime (21037945317799) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17773509 + ... + 18920187.

It is an arithmetic number, because the mean of its divisors is an integer number (316137955980).

Almost surely, 2^{21037945317792} 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 21037945317792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30349243774080).

21037945317792 is an abundant number, since it is smaller than the sum of its proper divisors (39660542230368).

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

21037945317792 is a wasteful number, since it uses less digits than its factorization.

21037945317792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147007 (or 1146999 counting only the distinct ones).

The product of its (nonzero) digits is 20003760, while the sum is 60.

The spelling of 21037945317792 in words is "twenty-one trillion, thirty-seven billion, nine hundred forty-five million, three hundred seventeen thousand, seven hundred ninety-two".