20312121123331 has 4 divisors (see below), whose sum is σ = 20336801708752. Its totient is φ = 20287440537912.

The previous prime is 20312121123319. The next prime is 20312121123341. The reversal of 20312121123331 is 13332112121302.

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

It is a cyclic number.

It is not a de Polignac number, because 20312121123331 - 2¹¹ = 20312121121283 is a prime.

It is a super-2 number, since 2×20312121123331² (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 = 20312121123296 and 20312121123305.

It is not an unprimeable number, because it can be changed into a prime (20312121123341) 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, 12340291476 + ... + 12340293121.

It is an arithmetic number, because the mean of its divisors is an integer number (5084200427188).

Almost surely, 2^{20312121123331} is an apocalyptic number.

20312121123331 is a deficient number, since it is larger than the sum of its proper divisors (24680585421).

20312121123331 is an equidigital number, since it uses as much as digits as its factorization.

20312121123331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24680585420.

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

Adding to 20312121123331 its reverse (13332112121302), we get a palindrome (33644233244633).

The spelling of 20312121123331 in words is "twenty trillion, three hundred twelve billion, one hundred twenty-one million, one hundred twenty-three thousand, three hundred thirty-one".