21872981770 has 8 divisors (see below), whose sum is σ = 39371367204. Its totient is φ = 8749192704.

The previous prime is 21872981747. The next prime is 21872981839. The reversal of 21872981770 is 7718927812.

It can be written as a sum of positive squares in 2 ways, for example, as 21797864881 + 75116889 = 147641^2 + 8667^2 .

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

It is an unprimeable number.

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, 1093649079 + ... + 1093649098.

Almost surely, 2^21872981770 is an apocalyptic number.

21872981770 is a deficient number, since it is larger than the sum of its proper divisors (17498385434).

21872981770 is a wasteful number, since it uses less digits than its factorization.

21872981770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2187298184.

The product of its (nonzero) digits is 790272, while the sum is 52.

The spelling of 21872981770 in words is "twenty-one billion, eight hundred seventy-two million, nine hundred eighty-one thousand, seven hundred seventy".