21740518146347 has 64 divisors (see below), whose sum is σ = 29795571456000. Its totient is φ = 15632396115840.

The previous prime is 21740518146337. The next prime is 21740518146463. The reversal of 21740518146347 is 74364181504712.

It is not a de Polignac number, because 21740518146347 - 2¹² = 21740518142251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21740518146337) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 152422058 + ... + 152564624.

It is an arithmetic number, because the mean of its divisors is an integer number (465555804000).

Almost surely, 2^{21740518146347} is an apocalyptic number.

21740518146347 is a deficient number, since it is larger than the sum of its proper divisors (8055053309653).

21740518146347 is a wasteful number, since it uses less digits than its factorization.

21740518146347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145721 (or 145707 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 21740518146347 in words is "twenty-one trillion, seven hundred forty billion, five hundred eighteen million, one hundred forty-six thousand, three hundred forty-seven".