21941904384 has 99 divisors (see below), whose sum is σ = 63397860123. Its totient is φ = 7309228032.

The previous prime is 21941904379. The next prime is 21941904503. The reversal of 21941904384 is 48340914912.

The square root of 21941904384 is 148128.

It is a perfect power (a square), and thus also a powerful number.

21941904384 is a `hidden beast` number, since 21 + 9 + 4 + 190 + 438 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14219517 + ... + 14221059.

Almost surely, 2^21941904384 is an apocalyptic number.

21941904384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

21941904384 is the 148128-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21941904384

21941904384 is an abundant number, since it is smaller than the sum of its proper divisors (41455955739).

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

21941904384 is an frugal number, since it uses more digits than its factorization.

21941904384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3112 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 21941904384 in words is "twenty-one billion, nine hundred forty-one million, nine hundred four thousand, three hundred eighty-four".