21489216881 has 8 divisors (see below), whose sum is σ = 24014557728. Its totient is φ = 19059172000.

The previous prime is 21489216869. The next prime is 21489216883. The reversal of 21489216881 is 18861298412.

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

It is not a de Polignac number, because 21489216881 - 2⁶ = 21489216817 is a prime.

It is a super-2 number, since 2×21489216881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21489216883) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 23823515 + ... + 23824416.

It is an arithmetic number, because the mean of its divisors is an integer number (3001819716).

Almost surely, 2^21489216881 is an apocalyptic number.

It is an amenable number.

21489216881 is a deficient number, since it is larger than the sum of its proper divisors (2525340847).

21489216881 is a wasteful number, since it uses less digits than its factorization.

21489216881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47647983.

The product of its digits is 442368, while the sum is 50.

The spelling of 21489216881 in words is "twenty-one billion, four hundred eighty-nine million, two hundred sixteen thousand, eight hundred eighty-one".