21164503345 has 16 divisors (see below), whose sum is σ = 27152461440. Its totient is φ = 15780904704.

The previous prime is 21164503343. The next prime is 21164503363. The reversal of 21164503345 is 54330546112.

It is not a de Polignac number, because 21164503345 - 2¹ = 21164503343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21164503345.

It is not an unprimeable number, because it can be changed into a prime (21164503343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1199955 + ... + 1217464.

It is an arithmetic number, because the mean of its divisors is an integer number (1697028840).

Almost surely, 2^21164503345 is an apocalyptic number.

It is an amenable number.

21164503345 is a deficient number, since it is larger than the sum of its proper divisors (5987958095).

21164503345 is a wasteful number, since it uses less digits than its factorization.

21164503345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2417544.

The product of its (nonzero) digits is 43200, while the sum is 34.

The spelling of 21164503345 in words is "twenty-one billion, one hundred sixty-four million, five hundred three thousand, three hundred forty-five".