21740350390039 has 4 divisors (see below), whose sum is σ = 21740510733480. Its totient is φ = 21740190046600.

The previous prime is 21740350389977. The next prime is 21740350390163. The reversal of 21740350390039 is 93009305304712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21740350390039 - 2²⁵ = 21740316835607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21740350390439) 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, 79968169 + ... + 80239570.

It is an arithmetic number, because the mean of its divisors is an integer number (5435127683370).

Almost surely, 2^{21740350390039} is an apocalyptic number.

21740350390039 is a deficient number, since it is larger than the sum of its proper divisors (160343441).

21740350390039 is a wasteful number, since it uses less digits than its factorization.

21740350390039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160343440.

The product of its (nonzero) digits is 612360, while the sum is 46.

The spelling of 21740350390039 in words is "twenty-one trillion, seven hundred forty billion, three hundred fifty million, three hundred ninety thousand, thirty-nine".