21406754882 has 8 divisors (see below), whose sum is σ = 32139406476. Its totient is φ = 10693619392.

The previous prime is 21406754881. The next prime is 21406754959. The reversal of 21406754882 is 28845760412.

It can be written as a sum of positive squares in 2 ways, for example, as 21231695521 + 175059361 = 145711^2 + 13231^2 .

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 (21406754881) 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 3 ways as a sum of consecutive naturals, for example, 4876283 + ... + 4880670.

Almost surely, 2^21406754882 is an apocalyptic number.

21406754882 is a deficient number, since it is larger than the sum of its proper divisors (10732651594).

21406754882 is a wasteful number, since it uses less digits than its factorization.

21406754882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9758052.

The product of its (nonzero) digits is 860160, while the sum is 47.

The spelling of 21406754882 in words is "twenty-one billion, four hundred six million, seven hundred fifty-four thousand, eight hundred eighty-two".