21346440545 has 8 divisors (see below), whose sum is σ = 25635795624. Its totient is φ = 17063774464.

The previous prime is 21346440539. The next prime is 21346440547. The reversal of 21346440545 is 54504464312.

It can be written as a sum of positive squares in 4 ways, for example, as 3042515281 + 18303925264 = 55159^2 + 135292^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21346440545 - 2⁴ = 21346440529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21346440499 and 21346440508.

It is not an unprimeable number, because it can be changed into a prime (21346440547) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1665224 + ... + 1677993.

It is an arithmetic number, because the mean of its divisors is an integer number (3204474453).

Almost surely, 2^21346440545 is an apocalyptic number.

It is an amenable number.

21346440545 is a deficient number, since it is larger than the sum of its proper divisors (4289355079).

21346440545 is a wasteful number, since it uses less digits than its factorization.

21346440545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344499.

The product of its (nonzero) digits is 230400, while the sum is 38.

The spelling of 21346440545 in words is "twenty-one billion, three hundred forty-six million, four hundred forty thousand, five hundred forty-five".