21427226184 has 64 divisors (see below), whose sum is σ = 65929933440. Its totient is φ = 5651136000.

The previous prime is 21427226147. The next prime is 21427226189. The reversal of 21427226184 is 48162272412.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21427226189) 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, 4903317 + ... + 4907684.

It is an arithmetic number, because the mean of its divisors is an integer number (1030155210).

Almost surely, 2^21427226184 is an apocalyptic number.

21427226184 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21427226184 is an abundant number, since it is smaller than the sum of its proper divisors (44502707256).

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

21427226184 is a wasteful number, since it uses less digits than its factorization.

21427226184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9811030 (or 9811026 counting only the distinct ones).

The product of its digits is 86016, while the sum is 39.

Adding to 21427226184 its reverse (48162272412), we get a palindrome (69589498596).

The spelling of 21427226184 in words is "twenty-one billion, four hundred twenty-seven million, two hundred twenty-six thousand, one hundred eighty-four".