31121102213 has 8 divisors (see below), whose sum is σ = 32214504960. Its totient is φ = 30033293040.

The previous prime is 31121102167. The next prime is 31121102249. The reversal of 31121102213 is 31220112113.

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 31121102213 - 2¹⁰ = 31121101189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121102191 and 31121102200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121102293) 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, 1387070 + ... + 1409327.

It is an arithmetic number, because the mean of its divisors is an integer number (4026813120).

Almost surely, 2^31121102213 is an apocalyptic number.

It is an amenable number.

31121102213 is a deficient number, since it is larger than the sum of its proper divisors (1093402747).

31121102213 is a wasteful number, since it uses less digits than its factorization.

31121102213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796787.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31121102213 its reverse (31220112113), we get a palindrome (62341214326).

The spelling of 31121102213 in words is "thirty-one billion, one hundred twenty-one million, one hundred two thousand, two hundred thirteen".