20127132421733 has 4 divisors (see below), whose sum is σ = 20128339607628. Its totient is φ = 20125925235840.

The previous prime is 20127132421727. The next prime is 20127132421777. The reversal of 20127132421733 is 33712423172102.

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 10572492862369 + 9554639559364 = 3251537^2 + 3091058^2 .

It is a cyclic number.

It is not a de Polignac number, because 20127132421733 - 2¹⁴ = 20127132405349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20127132427733) 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, 603567938 + ... + 603601283.

It is an arithmetic number, because the mean of its divisors is an integer number (5032084901907).

Almost surely, 2^{20127132421733} is an apocalyptic number.

It is an amenable number.

20127132421733 is a deficient number, since it is larger than the sum of its proper divisors (1207185895).

20127132421733 is a wasteful number, since it uses less digits than its factorization.

20127132421733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1207185894.

The product of its (nonzero) digits is 84672, while the sum is 38.

Adding to 20127132421733 its reverse (33712423172102), we get a palindrome (53839555593835).

The spelling of 20127132421733 in words is "twenty trillion, one hundred twenty-seven billion, one hundred thirty-two million, four hundred twenty-one thousand, seven hundred thirty-three".