21616940289 has 8 divisors (see below), whose sum is σ = 32940099520. Its totient is φ = 12352537296.

The previous prime is 21616940249. The next prime is 21616940299. The reversal of 21616940289 is 98204961612.

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

It is not a de Polignac number, because 21616940289 - 2⁹ = 21616939777 is a prime.

It is a super-3 number, since 3×21616940289³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21616940249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514689034 + ... + 514689075.

It is an arithmetic number, because the mean of its divisors is an integer number (4117512440).

Almost surely, 2^21616940289 is an apocalyptic number.

It is an amenable number.

21616940289 is a deficient number, since it is larger than the sum of its proper divisors (11323159231).

21616940289 is a wasteful number, since it uses less digits than its factorization.

21616940289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029378119.

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 21616940289 in words is "twenty-one billion, six hundred sixteen million, nine hundred forty thousand, two hundred eighty-nine".