21866998272 has 160 divisors (see below), whose sum is σ = 70494095232. Its totient is φ = 5880152064.

The previous prime is 21866998253. The next prime is 21866998273. The reversal of 21866998272 is 27289966812.

It is a super-2 number, since 2×21866998272² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21866998273) 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 15 ways as a sum of consecutive naturals, for example, 122968 + ... + 242600.

Almost surely, 2^21866998272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21866998272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35247047616).

21866998272 is an abundant number, since it is smaller than the sum of its proper divisors (48627096960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21866998272 is a wasteful number, since it uses less digits than its factorization.

21866998272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119678 (or 119662 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 60.

The spelling of 21866998272 in words is "twenty-one billion, eight hundred sixty-six million, nine hundred ninety-eight thousand, two hundred seventy-two".