21652432534645 has 64 divisors (see below), whose sum is σ = 28813253603328. Its totient is φ = 15489208800000.

The previous prime is 21652432534639. The next prime is 21652432534661. The reversal of 21652432534645 is 54643523425612.

It is a happy number.

It is not a de Polignac number, because 21652432534645 - 2¹¹ = 21652432532597 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21652432534592 and 21652432534601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3668035764 + ... + 3668041666.

It is an arithmetic number, because the mean of its divisors is an integer number (450207087552).

Almost surely, 2^{21652432534645} is an apocalyptic number.

It is an amenable number.

21652432534645 is a deficient number, since it is larger than the sum of its proper divisors (7160821068683).

21652432534645 is a wasteful number, since it uses less digits than its factorization.

21652432534645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10234.

The product of its digits is 20736000, while the sum is 52.

The spelling of 21652432534645 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred thirty-two million, five hundred thirty-four thousand, six hundred forty-five".