21741537923 has 32 divisors (see below), whose sum is σ = 26352893952. Its totient is φ = 17542980000.

The previous prime is 21741537877. The next prime is 21741537929. The reversal of 21741537923 is 32973514712.

It is not a de Polignac number, because 21741537923 - 2⁶ = 21741537859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21741537929) 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 31 ways as a sum of consecutive naturals, for example, 2337440 + ... + 2346722.

It is an arithmetic number, because the mean of its divisors is an integer number (823527936).

Almost surely, 2^21741537923 is an apocalyptic number.

21741537923 is a deficient number, since it is larger than the sum of its proper divisors (4611356029).

21741537923 is a wasteful number, since it uses less digits than its factorization.

21741537923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9615.

The product of its digits is 317520, while the sum is 44.

The spelling of 21741537923 in words is "twenty-one billion, seven hundred forty-one million, five hundred thirty-seven thousand, nine hundred twenty-three".