31111111322121 has 8 divisors (see below), whose sum is σ = 41481806230144. Its totient is φ = 20740578647760.

The previous prime is 31111111322111. The next prime is 31111111322183. The reversal of 31111111322121 is 12122311111113.

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

It is not a de Polignac number, because 31111111322121 - 2¹⁷ = 31111111191049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31111111322111) 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 7 ways as a sum of consecutive naturals, for example, 40110250 + ... + 40878531.

It is an arithmetic number, because the mean of its divisors is an integer number (5185225778768).

Almost surely, 2^{31111111322121} is an apocalyptic number.

It is an amenable number.

31111111322121 is a deficient number, since it is larger than the sum of its proper divisors (10370694908023).

31111111322121 is a wasteful number, since it uses less digits than its factorization.

31111111322121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81116831.

The product of its digits is 72, while the sum is 21.

Adding to 31111111322121 its reverse (12122311111113), we get a palindrome (43233422433234).

The spelling of 31111111322121 in words is "thirty-one trillion, one hundred eleven billion, one hundred eleven million, three hundred twenty-two thousand, one hundred twenty-one".