21044132378 has 8 divisors (see below), whose sum is σ = 31998612468. Its totient is φ = 10377928224.

The previous prime is 21044132377. The next prime is 21044132387. The reversal of 21044132378 is 87323144012.

It can be written as a sum of positive squares in 2 ways, for example, as 19256280289 + 1787852089 = 138767^2 + 42283^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21044132377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72068801 + ... + 72069092.

Almost surely, 2^21044132378 is an apocalyptic number.

21044132378 is a deficient number, since it is larger than the sum of its proper divisors (10954480090).

21044132378 is a wasteful number, since it uses less digits than its factorization.

21044132378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144137968.

The product of its (nonzero) digits is 32256, while the sum is 35.

The spelling of 21044132378 in words is "twenty-one billion, forty-four million, one hundred thirty-two thousand, three hundred seventy-eight".