21740518146346 has 4 divisors (see below), whose sum is σ = 32610777219522. Its totient is φ = 10870259073172.

The previous prime is 21740518146337. The next prime is 21740518146463. The reversal of 21740518146346 is 64364181504712.

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

It can be written as a sum of positive squares in only one way, i.e., 21375688858225 + 364829288121 = 4623385^2 + 604011^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21740518146293 and 21740518146302.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5435129536585 + ... + 5435129536588.

Almost surely, 2^{21740518146346} is an apocalyptic number.

21740518146346 is a deficient number, since it is larger than the sum of its proper divisors (10870259073176).

21740518146346 is a wasteful number, since it uses less digits than its factorization.

21740518146346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10870259073175.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 21740518146346 in words is "twenty-one trillion, seven hundred forty billion, five hundred eighteen million, one hundred forty-six thousand, three hundred forty-six".