21652406544345 has 32 divisors (see below), whose sum is σ = 34700921424000. Its totient is φ = 11528939971584.

The previous prime is 21652406544337. The next prime is 21652406544367. The reversal of 21652406544345 is 54344560425612.

It is not a de Polignac number, because 21652406544345 - 2³ = 21652406544337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25395121 + ... + 26233889.

It is an arithmetic number, because the mean of its divisors is an integer number (1084403794500).

Almost surely, 2^{21652406544345} is an apocalyptic number.

It is an amenable number.

21652406544345 is a deficient number, since it is larger than the sum of its proper divisors (13048514879655).

21652406544345 is a wasteful number, since it uses less digits than its factorization.

21652406544345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841609.

The product of its (nonzero) digits is 13824000, while the sum is 51.

Adding to 21652406544345 its reverse (54344560425612), we get a palindrome (75996966969957).

The spelling of 21652406544345 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred six million, five hundred forty-four thousand, three hundred forty-five".