31121002111 has 8 divisors (see below), whose sum is σ = 33107822064. Its totient is φ = 29151534720.

The previous prime is 31121002097. The next prime is 31121002151. The reversal of 31121002111 is 11120012113.

It is a happy number.

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

It is not a de Polignac number, because 31121002111 - 2²¹ = 31118904959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121002091 and 31121002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31121002151) 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, 4334440 + ... + 4341613.

It is an arithmetic number, because the mean of its divisors is an integer number (4138477758).

Almost surely, 2^31121002111 is an apocalyptic number.

31121002111 is a deficient number, since it is larger than the sum of its proper divisors (1986819953).

31121002111 is a wasteful number, since it uses less digits than its factorization.

31121002111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8676281.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31121002111 its reverse (11120012113), we get a palindrome (42241014224).

The spelling of 31121002111 in words is "thirty-one billion, one hundred twenty-one million, two thousand, one hundred eleven".