21701350075621 has 4 divisors (see below), whose sum is σ = 21743003339244. Its totient is φ = 21659696812000.

The previous prime is 21701350075619. The next prime is 21701350075663. The reversal of 21701350075621 is 12657005310712.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10698695224996 + 11002654850625 = 3270886^2 + 3317025^2 .

It is a cyclic number.

It is not a de Polignac number, because 21701350075621 - 2¹ = 21701350075619 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21701350072621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20826631030 + ... + 20826632071.

It is an arithmetic number, because the mean of its divisors is an integer number (5435750834811).

Almost surely, 2^{21701350075621} is an apocalyptic number.

It is an amenable number.

21701350075621 is a deficient number, since it is larger than the sum of its proper divisors (41653263623).

21701350075621 is an equidigital number, since it uses as much as digits as its factorization.

21701350075621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41653263622.

The product of its (nonzero) digits is 88200, while the sum is 40.

The spelling of 21701350075621 in words is "twenty-one trillion, seven hundred one billion, three hundred fifty million, seventy-five thousand, six hundred twenty-one".