21112081289 has 32 divisors (see below), whose sum is σ = 23386481664. Its totient is φ = 18940469760.

The previous prime is 21112081253. The next prime is 21112081301. The reversal of 21112081289 is 98218021112.

It is a cyclic number.

It is not a de Polignac number, because 21112081289 - 2⁸ = 21112081033 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21112081589) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26489039 + ... + 26489835.

It is an arithmetic number, because the mean of its divisors is an integer number (730827552).

Almost surely, 2^21112081289 is an apocalyptic number.

It is an amenable number.

21112081289 is a deficient number, since it is larger than the sum of its proper divisors (2274400375).

21112081289 is a wasteful number, since it uses less digits than its factorization.

21112081289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its (nonzero) digits is 4608, while the sum is 35.

The spelling of 21112081289 in words is "twenty-one billion, one hundred twelve million, eighty-one thousand, two hundred eighty-nine".