31111021123121 has 16 divisors (see below), whose sum is σ = 32217703233408. Its totient is φ = 30019006944000.

The previous prime is 31111021123069. The next prime is 31111021123159. The reversal of 31111021123121 is 12132112011113.

It is not a de Polignac number, because 31111021123121 - 2¹⁸ = 31111020860977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31111021123093 and 31111021123102.

It is not an unprimeable number, because it can be changed into a prime (31111021123421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1382075 + ... + 8008256.

It is an arithmetic number, because the mean of its divisors is an integer number (2013606452088).

Almost surely, 2^{31111021123121} is an apocalyptic number.

It is an amenable number.

31111021123121 is a deficient number, since it is larger than the sum of its proper divisors (1106682110287).

31111021123121 is a wasteful number, since it uses less digits than its factorization.

31111021123121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9391112.

The product of its (nonzero) digits is 72, while the sum is 20.

Adding to 31111021123121 its reverse (12132112011113), we get a palindrome (43243133134234).

The spelling of 31111021123121 in words is "thirty-one trillion, one hundred eleven billion, twenty-one million, one hundred twenty-three thousand, one hundred twenty-one".