21329211744 has 36 divisors (see below), whose sum is σ = 60654946716. Its totient is φ = 7109737152.

The previous prime is 21329211733. The next prime is 21329211751. The reversal of 21329211744 is 44711292312.

21329211744 is a `hidden beast` number, since 213 + 292 + 117 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21329211699 and 21329211708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37029594 + ... + 37030169.

It is an arithmetic number, because the mean of its divisors is an integer number (1684859631).

Almost surely, 2^21329211744 is an apocalyptic number.

21329211744 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21329211744 is an abundant number, since it is smaller than the sum of its proper divisors (39325734972).

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

21329211744 is a wasteful number, since it uses less digits than its factorization.

21329211744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74059779 (or 74059768 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The spelling of 21329211744 in words is "twenty-one billion, three hundred twenty-nine million, two hundred eleven thousand, seven hundred forty-four".