21027575356705 has 8 divisors (see below), whose sum is σ = 25233115407552. Its totient is φ = 16822043632368.

The previous prime is 21027575356673. The next prime is 21027575356709. The reversal of 21027575356705 is 50765357572012.

It is a happy number.

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 21027575356705 - 2⁵ = 21027575356673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21027575356709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7402284 + ... + 9841186.

It is an arithmetic number, because the mean of its divisors is an integer number (3154139425944).

Almost surely, 2^{21027575356705} is an apocalyptic number.

It is an amenable number.

21027575356705 is a deficient number, since it is larger than the sum of its proper divisors (4205540050847).

21027575356705 is a wasteful number, since it uses less digits than its factorization.

21027575356705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4163255.

The product of its (nonzero) digits is 15435000, while the sum is 55.

The spelling of 21027575356705 in words is "twenty-one trillion, twenty-seven billion, five hundred seventy-five million, three hundred fifty-six thousand, seven hundred five".