21343401745 has 16 divisors (see below), whose sum is σ = 26153893440. Its totient is φ = 16716642624.

The previous prime is 21343401721. The next prime is 21343401763. The reversal of 21343401745 is 54710434312.

It is a cyclic number.

It is not a de Polignac number, because 21343401745 - 2⁷ = 21343401617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21343401745.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 140830 + ... + 250039.

It is an arithmetic number, because the mean of its divisors is an integer number (1634618340).

Almost surely, 2^21343401745 is an apocalyptic number.

It is an amenable number.

21343401745 is a deficient number, since it is larger than the sum of its proper divisors (4810491695).

21343401745 is a wasteful number, since it uses less digits than its factorization.

21343401745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391104.

The product of its (nonzero) digits is 40320, while the sum is 34.

The spelling of 21343401745 in words is "twenty-one billion, three hundred forty-three million, four hundred one thousand, seven hundred forty-five".