20123121332131 has 4 divisors (see below), whose sum is σ = 20123293740352. Its totient is φ = 20122948923912.

The previous prime is 20123121332071. The next prime is 20123121332191. The reversal of 20123121332131 is 13123312132102.

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

It is an interprime number because it is at equal distance from previous prime (20123121332071) and next prime (20123121332191).

It is a cyclic number.

It is not a de Polignac number, because 20123121332131 - 2¹¹ = 20123121330083 is a prime.

It is a super-2 number, since 2×20123121332131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123121332096 and 20123121332105.

It is not an unprimeable number, because it can be changed into a prime (20123121332191) 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, 86028915 + ... + 86262508.

It is an arithmetic number, because the mean of its divisors is an integer number (5030823435088).

Almost surely, 2^{20123121332131} is an apocalyptic number.

20123121332131 is a deficient number, since it is larger than the sum of its proper divisors (172408221).

20123121332131 is a wasteful number, since it uses less digits than its factorization.

20123121332131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172408220.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 20123121332131 its reverse (13123312132102), we get a palindrome (33246433464233).

The spelling of 20123121332131 in words is "twenty trillion, one hundred twenty-three billion, one hundred twenty-one million, three hundred thirty-two thousand, one hundred thirty-one".