123311021131 has 4 divisors (see below), whose sum is σ = 123311729200. Its totient is φ = 123310313064.

The previous prime is 123311021101. The next prime is 123311021149. The reversal of 123311021131 is 131120113321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 131120113321 = 1913 ⋅68541617.

It is a cyclic number.

It is not a de Polignac number, because 123311021131 - 2¹⁹ = 123310496843 is a prime.

It is a super-2 number, since 2×123311021131² (a number of 23 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 = 123311021099 and 123311021108.

It is not an unprimeable number, because it can be changed into a prime (123311021101) 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, 109450 + ... + 508528.

It is an arithmetic number, because the mean of its divisors is an integer number (30827932300).

Almost surely, 2^123311021131 is an apocalyptic number.

123311021131 is a deficient number, since it is larger than the sum of its proper divisors (708069).

123311021131 is an equidigital number, since it uses as much as digits as its factorization.

123311021131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 708068.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 123311021131 its reverse (131120113321), we get a palindrome (254431134452).

The spelling of 123311021131 in words is "one hundred twenty-three billion, three hundred eleven million, twenty-one thousand, one hundred thirty-one".