21998121322 has 8 divisors (see below), whose sum is σ = 33048661572. Its totient is φ = 10981900800.

The previous prime is 21998121293. The next prime is 21998121443. The reversal of 21998121322 is 22312189912.

It can be written as a sum of positive squares in 2 ways, for example, as 20888631841 + 1109489481 = 144529^2 + 33309^2 .

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8578329 + ... + 8580892.

Almost surely, 2^21998121322 is an apocalyptic number.

21998121322 is a deficient number, since it is larger than the sum of its proper divisors (11050540250).

21998121322 is a wasteful number, since it uses less digits than its factorization.

21998121322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17159864.

The product of its digits is 31104, while the sum is 40.

The spelling of 21998121322 in words is "twenty-one billion, nine hundred ninety-eight million, one hundred twenty-one thousand, three hundred twenty-two".