21843367881 has 32 divisors (see below), whose sum is σ = 32566302720. Its totient is φ = 12951738624.

The previous prime is 21843367877. The next prime is 21843367919. The reversal of 21843367881 is 18876334812.

It is not a de Polignac number, because 21843367881 - 2² = 21843367877 is a prime.

It is a super-2 number, since 2×21843367881² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (21843367801) 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, 14821 + ... + 209538.

It is an arithmetic number, because the mean of its divisors is an integer number (1017696960).

Almost surely, 2^21843367881 is an apocalyptic number.

It is an amenable number.

21843367881 is a deficient number, since it is larger than the sum of its proper divisors (10722934839).

21843367881 is a wasteful number, since it uses less digits than its factorization.

21843367881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224485.

The product of its digits is 1548288, while the sum is 51.

The spelling of 21843367881 in words is "twenty-one billion, eight hundred forty-three million, three hundred sixty-seven thousand, eight hundred eighty-one".