21740231337 has 12 divisors (see below), whose sum is σ = 31623386736. Its totient is φ = 13175384440.

The previous prime is 21740231333. The next prime is 21740231339. The reversal of 21740231337 is 73313204712.

It is not a de Polignac number, because 21740231337 - 2² = 21740231333 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 21740231298 and 21740231307.

It is not an unprimeable number, because it can be changed into a prime (21740231333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 834178 + ... + 859844.

It is an arithmetic number, because the mean of its divisors is an integer number (2635282228).

Almost surely, 2^21740231337 is an apocalyptic number.

It is an amenable number.

21740231337 is a deficient number, since it is larger than the sum of its proper divisors (9883155399).

21740231337 is an frugal number, since it uses more digits than its factorization.

21740231337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51348 (or 25681 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 33.

Multiplying 21740231337 by its sum of digits (33), we get a square (717427634121 = 847011²).

21740231337 divided by its sum of digits (33) gives a square (658794889 = 25667²).

The spelling of 21740231337 in words is "twenty-one billion, seven hundred forty million, two hundred thirty-one thousand, three hundred thirty-seven".