21652420303665 has 192 divisors, whose sum is σ = 39964906275840. Its totient is φ = 10826510069760.

The previous prime is 21652420303651. The next prime is 21652420303667. The reversal of 21652420303665 is 56630302425612.

21652420303665 is a `hidden beast` number, since 2 + 1 + 6 + 524 + 2 + 0 + 30 + 36 + 65 = 666.

It is not a de Polignac number, because 21652420303665 - 2³⁶ = 21583700826929 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21652420303665.

It is not an unprimeable number, because it can be changed into a prime (21652420303667) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4187276530 + ... + 4187281700.

It is an arithmetic number, because the mean of its divisors is an integer number (208150553520).

Almost surely, 2^{21652420303665} is an apocalyptic number.

It is an amenable number.

21652420303665 is a deficient number, since it is larger than the sum of its proper divisors (18312485972175).

21652420303665 is a wasteful number, since it uses less digits than its factorization.

21652420303665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784 (or 5781 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The spelling of 21652420303665 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred twenty million, three hundred three thousand, six hundred sixty-five".