21375023712 has 576 divisors, whose sum is σ = 73663478784. Its totient is φ = 5295144960.

The previous prime is 21375023699. The next prime is 21375023713. The reversal of 21375023712 is 21732057312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21375023713) 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 95 ways as a sum of consecutive naturals, for example, 292808508 + ... + 292808580.

It is an arithmetic number, because the mean of its divisors is an integer number (127887984).

Almost surely, 2^21375023712 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 21375023712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36831739392).

21375023712 is an abundant number, since it is smaller than the sum of its proper divisors (52288455072).

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

21375023712 is a wasteful number, since it uses less digits than its factorization.

21375023712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 192 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 33.

The spelling of 21375023712 in words is "twenty-one billion, three hundred seventy-five million, twenty-three thousand, seven hundred twelve".