21373660661071 has 8 divisors (see below), whose sum is σ = 21693141081344. Its totient is φ = 21054194080920.

The previous prime is 21373660661069. The next prime is 21373660661083. The reversal of 21373660661071 is 17016606637312.

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 21373660661071 - 2¹ = 21373660661069 is a prime.

It is a super-2 number, since 2×21373660661071² (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 (21373660662071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 327255 + ... + 6546328.

It is an arithmetic number, because the mean of its divisors is an integer number (2711642635168).

Almost surely, 2^{21373660661071} is an apocalyptic number.

21373660661071 is a deficient number, since it is larger than the sum of its proper divisors (319480420273).

21373660661071 is an equidigital number, since it uses as much as digits as its factorization.

21373660661071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6920061.

The product of its (nonzero) digits is 1143072, while the sum is 49.

The spelling of 21373660661071 in words is "twenty-one trillion, three hundred seventy-three billion, six hundred sixty million, six hundred sixty-one thousand, seventy-one".