21461216889 has 64 divisors (see below), whose sum is σ = 35717120000. Its totient is φ = 11185542720.

The previous prime is 21461216863. The next prime is 21461216977. The reversal of 21461216889 is 98861216412.

It is not a de Polignac number, because 21461216889 - 2⁸ = 21461216633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21461214889) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2457072 + ... + 2465790.

It is an arithmetic number, because the mean of its divisors is an integer number (558080000).

Almost surely, 2^21461216889 is an apocalyptic number.

It is an amenable number.

21461216889 is a deficient number, since it is larger than the sum of its proper divisors (14255903111).

21461216889 is a wasteful number, since it uses less digits than its factorization.

21461216889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8978.

The product of its digits is 331776, while the sum is 48.

The spelling of 21461216889 in words is "twenty-one billion, four hundred sixty-one million, two hundred sixteen thousand, eight hundred eighty-nine".