31121211121 has 32 divisors (see below), whose sum is σ = 41934203136. Its totient is φ = 22305024000.

The previous prime is 31121211097. The next prime is 31121211131. The reversal of 31121211121 is 12111212113.

It is a happy number.

It is not a de Polignac number, because 31121211121 - 2⁷ = 31121210993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31121211095 and 31121211104.

It is not an unprimeable number, because it can be changed into a prime (31121211131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225961 + ... + 336601.

It is an arithmetic number, because the mean of its divisors is an integer number (1310443848).

Almost surely, 2^31121211121 is an apocalyptic number.

It is an amenable number.

31121211121 is a deficient number, since it is larger than the sum of its proper divisors (10812992015).

31121211121 is a wasteful number, since it uses less digits than its factorization.

31121211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110953.

The product of its digits is 24, while the sum is 16.

Adding to 31121211121 its reverse (12111212113), we get a palindrome (43232423234).

It can be divided in two parts, 31121 and 211121, that added together give a palindrome (242242).

The spelling of 31121211121 in words is "thirty-one billion, one hundred twenty-one million, two hundred eleven thousand, one hundred twenty-one".