21552988370 has 8 divisors (see below), whose sum is σ = 38795379084. Its totient is φ = 8621195344.

The previous prime is 21552988357. The next prime is 21552988393. The reversal of 21552988370 is 7388925512.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18061478449 + 3491509921 = 134393^2 + 59089^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1077649409 + ... + 1077649428.

Almost surely, 2^21552988370 is an apocalyptic number.

21552988370 is a deficient number, since it is larger than the sum of its proper divisors (17242390714).

21552988370 is a wasteful number, since it uses less digits than its factorization.

21552988370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2155298844.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 21552988370 in words is "twenty-one billion, five hundred fifty-two million, nine hundred eighty-eight thousand, three hundred seventy".