31111121321221 has 8 divisors (see below), whose sum is σ = 32748677251200. Its totient is φ = 29473578240480.

The previous prime is 31111121321213. The next prime is 31111121321239. The reversal of 31111121321221 is 12212312111113.

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

It is a cyclic number.

It is not a de Polignac number, because 31111121321221 - 2³ = 31111121321213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31111121321192 and 31111121321201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31111121321261) 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, 1972185 + ... + 8130913.

It is an arithmetic number, because the mean of its divisors is an integer number (4093584656400).

Almost surely, 2^{31111121321221} is an apocalyptic number.

It is an amenable number.

31111121321221 is a deficient number, since it is larger than the sum of its proper divisors (1637555929979).

31111121321221 is a wasteful number, since it uses less digits than its factorization.

31111121321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6424619.

The product of its digits is 144, while the sum is 22.

Adding to 31111121321221 its reverse (12212312111113), we get a palindrome (43323433432334).

The spelling of 31111121321221 in words is "thirty-one trillion, one hundred eleven billion, one hundred twenty-one million, three hundred twenty-one thousand, two hundred twenty-one".