21624070345 has 8 divisors (see below), whose sum is σ = 25974506376. Its totient is φ = 17282174976.

The previous prime is 21624070343. The next prime is 21624070399. The reversal of 21624070345 is 54307042612.

It can be written as a sum of positive squares in 4 ways, for example, as 53860921 + 21570209424 = 7339^2 + 146868^2 .

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 21624070345 - 2¹ = 21624070343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21624070345.

It is not an unprimeable number, because it can be changed into a prime (21624070343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2129592 + ... + 2139721.

It is an arithmetic number, because the mean of its divisors is an integer number (3246813297).

Almost surely, 2^21624070345 is an apocalyptic number.

It is an amenable number.

21624070345 is a deficient number, since it is larger than the sum of its proper divisors (4350436031).

21624070345 is a wasteful number, since it uses less digits than its factorization.

21624070345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270331.

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

The spelling of 21624070345 in words is "twenty-one billion, six hundred twenty-four million, seventy thousand, three hundred forty-five".