21837223816 has 16 divisors (see below), whose sum is σ = 40946484240. Its totient is φ = 10918161360.

The previous prime is 21837223787. The next prime is 21837223817. The reversal of 21837223816 is 61832273812.

It is not an unprimeable number, because it can be changed into a prime (21837223817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243655 + ... + 321001.

It is an arithmetic number, because the mean of its divisors is an integer number (2559155265).

Almost surely, 2^21837223816 is an apocalyptic number.

It is an amenable number.

21837223816 is a deficient number, since it is larger than the sum of its proper divisors (19109260424).

21837223816 is a wasteful number, since it uses less digits than its factorization.

21837223816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112644 (or 112640 counting only the distinct ones).

The product of its digits is 193536, while the sum is 43.

The spelling of 21837223816 in words is "twenty-one billion, eight hundred thirty-seven million, two hundred twenty-three thousand, eight hundred sixteen".