21987162410 has 8 divisors (see below), whose sum is σ = 39576892356. Its totient is φ = 8794864960.

The previous prime is 21987162389. The next prime is 21987162427. The reversal of 21987162410 is 1426178912.

It can be written as a sum of positive squares in 2 ways, for example, as 20552949769 + 1434212641 = 143363^2 + 37871^2 .

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, 1099358111 + ... + 1099358130.

Almost surely, 2^21987162410 is an apocalyptic number.

21987162410 is a deficient number, since it is larger than the sum of its proper divisors (17589729946).

21987162410 is a wasteful number, since it uses less digits than its factorization.

21987162410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198716248.

The product of its (nonzero) digits is 48384, while the sum is 41.

The spelling of 21987162410 in words is "twenty-one billion, nine hundred eighty-seven million, one hundred sixty-two thousand, four hundred ten".