21837730844 has 6 divisors (see below), whose sum is σ = 38216028984. Its totient is φ = 10918865420.

The previous prime is 21837730813. The next prime is 21837730847. The reversal of 21837730844 is 44803773812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21837730847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2729716352 + ... + 2729716359.

It is an arithmetic number, because the mean of its divisors is an integer number (6369338164).

Almost surely, 2^21837730844 is an apocalyptic number.

It is an amenable number.

21837730844 is a deficient number, since it is larger than the sum of its proper divisors (16378298140).

21837730844 is a wasteful number, since it uses less digits than its factorization.

21837730844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5459432715 (or 5459432713 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 21837730844 in words is "twenty-one billion, eight hundred thirty-seven million, seven hundred thirty thousand, eight hundred forty-four".