21066938752 has 32 divisors (see below), whose sum is σ = 42384855600. Its totient is φ = 10429171200.

The previous prime is 21066938741. The next prime is 21066938771. The reversal of 21066938752 is 25783966012.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 21066938696 and 21066938705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 801852 + ... + 827707.

Almost surely, 2^21066938752 is an apocalyptic number.

It is an amenable number.

21066938752 is an abundant number, since it is smaller than the sum of its proper divisors (21317916848).

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

21066938752 is a wasteful number, since it uses less digits than its factorization.

21066938752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629674 (or 1629662 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 21066938752 in words is "twenty-one billion, sixty-six million, nine hundred thirty-eight thousand, seven hundred fifty-two".