21582730548645 has 16 divisors (see below), whose sum is σ = 39465564432000. Its totient is φ = 9866391107904.

The previous prime is 21582730548637. The next prime is 21582730548661. The reversal of 21582730548645 is 54684503728512.

It is a happy number.

It is not a de Polignac number, because 21582730548645 - 2³ = 21582730548637 is a prime.

It is a super-2 number, since 2×21582730548645² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102774907270 + ... + 102774907479.

It is an arithmetic number, because the mean of its divisors is an integer number (2466597777000).

Almost surely, 2^{21582730548645} is an apocalyptic number.

It is an amenable number.

21582730548645 is a deficient number, since it is larger than the sum of its proper divisors (17882833883355).

21582730548645 is a wasteful number, since it uses less digits than its factorization.

21582730548645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205549814764.

The product of its (nonzero) digits is 64512000, while the sum is 60.

The spelling of 21582730548645 in words is "twenty-one trillion, five hundred eighty-two billion, seven hundred thirty million, five hundred forty-eight thousand, six hundred forty-five".