20123121311031 has 8 divisors (see below), whose sum is σ = 28242977278720. Its totient is φ = 12709339775352.

The previous prime is 20123121311003. The next prime is 20123121311053. The reversal of 20123121311031 is 13011312132102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 20123121311031 - 2⁹ = 20123121310519 is a prime.

It is a super-2 number, since 2×20123121311031² (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 = 20123121310989 and 20123121311007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123121381031) 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, 176518607935 + ... + 176518608048.

It is an arithmetic number, because the mean of its divisors is an integer number (3530372159840).

Almost surely, 2^{20123121311031} is an apocalyptic number.

20123121311031 is a deficient number, since it is larger than the sum of its proper divisors (8119855967689).

20123121311031 is a wasteful number, since it uses less digits than its factorization.

20123121311031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353037216005.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 20123121311031 its reverse (13011312132102), we get a palindrome (33134433443133).

The spelling of 20123121311031 in words is "twenty trillion, one hundred twenty-three billion, one hundred twenty-one million, three hundred eleven thousand, thirty-one".