21652431640506 has 48 divisors (see below), whose sum is σ = 47712879171360. Its totient is φ = 7094661363360.

The previous prime is 21652431640481. The next prime is 21652431640507. The reversal of 21652431640506 is 60504613425612.

21652431640506 is a `hidden beast` number, since 2 + 1 + 6 + 52 + 4 + 31 + 64 + 0 + 506 = 666.

It is not an unprimeable number, because it can be changed into a prime (21652431640507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4510680 + ... + 7978163.

It is an arithmetic number, because the mean of its divisors is an integer number (994018316070).

Almost surely, 2^{21652431640506} is an apocalyptic number.

21652431640506 is an abundant number, since it is smaller than the sum of its proper divisors (26060447530854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21652431640506 is a wasteful number, since it uses less digits than its factorization.

21652431640506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12490491 (or 12490488 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

The spelling of 21652431640506 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred thirty-one million, six hundred forty thousand, five hundred six".