21610216489 has 8 divisors (see below), whose sum is σ = 21875946120. Its totient is φ = 21345363456.

The previous prime is 21610216457. The next prime is 21610216493. The reversal of 21610216489 is 98461201612.

It can be written as a sum of positive squares in 4 ways, for example, as 4734128025 + 16876088464 = 68805^2 + 129908^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21610216489 - 2⁵ = 21610216457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21610226489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169474 + ... + 268219.

It is an arithmetic number, because the mean of its divisors is an integer number (2734493265).

Almost surely, 2^21610216489 is an apocalyptic number.

It is an amenable number.

21610216489 is a deficient number, since it is larger than the sum of its proper divisors (265729631).

21610216489 is an equidigital number, since it uses as much as digits as its factorization.

21610216489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438299.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 21610216489 in words is "twenty-one billion, six hundred ten million, two hundred sixteen thousand, four hundred eighty-nine".