21127361835161 has 8 divisors (see below), whose sum is σ = 21197605572360. Its totient is φ = 21057140714368.

The previous prime is 21127361835113. The next prime is 21127361835169. The reversal of 21127361835161 is 16153816372112.

It can be written as a sum of positive squares in 4 ways, for example, as 773729585161 + 20353632250000 = 879619^2 + 4511500^2 .

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 21127361835161 - 2²⁶ = 21127294726297 is a prime.

It is a super-2 number, since 2×21127361835161² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21127361835169) 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, 3781646 + ... + 7520343.

It is an arithmetic number, because the mean of its divisors is an integer number (2649700696545).

Almost surely, 2^{21127361835161} is an apocalyptic number.

It is an amenable number.

21127361835161 is a deficient number, since it is larger than the sum of its proper divisors (70243737199).

21127361835161 is a wasteful number, since it uses less digits than its factorization.

21127361835161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11308203.

The product of its digits is 362880, while the sum is 47.

The spelling of 21127361835161 in words is "twenty-one trillion, one hundred twenty-seven billion, three hundred sixty-one million, eight hundred thirty-five thousand, one hundred sixty-one".