21298118281 has 16 divisors (see below), whose sum is σ = 23328917568. Its totient is φ = 19283204800.

The previous prime is 21298118273. The next prime is 21298118297. The reversal of 21298118281 is 18281189212.

It is a cyclic number.

It is not a de Polignac number, because 21298118281 - 2³ = 21298118273 is a prime.

It is a super-2 number, since 2×21298118281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21298118981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5204046 + ... + 5208136.

It is an arithmetic number, because the mean of its divisors is an integer number (1458057348).

Almost surely, 2^21298118281 is an apocalyptic number.

It is an amenable number.

21298118281 is a deficient number, since it is larger than the sum of its proper divisors (2030799287).

21298118281 is a wasteful number, since it uses less digits than its factorization.

21298118281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5912.

The product of its digits is 36864, while the sum is 43.

The spelling of 21298118281 in words is "twenty-one billion, two hundred ninety-eight million, one hundred eighteen thousand, two hundred eighty-one".