21575687212799 has 8 divisors (see below), whose sum is σ = 22161326851440. Its totient is φ = 20990179835136.

The previous prime is 21575687212787. The next prime is 21575687212889. The reversal of 21575687212799 is 99721278657512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21575687212799 - 2¹⁶ = 21575687147263 is a prime.

It is a super-2 number, since 2×21575687212799² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21575687212399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32734514 + ... + 33387119.

It is an arithmetic number, because the mean of its divisors is an integer number (2770165856430).

Almost surely, 2^{21575687212799} is an apocalyptic number.

21575687212799 is a deficient number, since it is larger than the sum of its proper divisors (585639638641).

21575687212799 is an equidigital number, since it uses as much as digits as its factorization.

21575687212799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66130489.

The product of its digits is 266716800, while the sum is 71.

The spelling of 21575687212799 in words is "twenty-one trillion, five hundred seventy-five billion, six hundred eighty-seven million, two hundred twelve thousand, seven hundred ninety-nine".