31212113223121 has 8 divisors (see below), whose sum is σ = 31626871845120. Its totient is φ = 30797846315808.

The previous prime is 31212113223103. The next prime is 31212113223149. The reversal of 31212113223121 is 12132231121213.

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 31212113223121 - 2¹⁵ = 31212113190353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212113223521) 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, 122800876 + ... + 123054781.

It is an arithmetic number, because the mean of its divisors is an integer number (3953358980640).

Almost surely, 2^{31212113223121} is an apocalyptic number.

It is an amenable number.

31212113223121 is a deficient number, since it is larger than the sum of its proper divisors (414758621999).

31212113223121 is a wasteful number, since it uses less digits than its factorization.

31212113223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245857343.

The product of its digits is 864, while the sum is 25.

Adding to 31212113223121 its reverse (12132231121213), we get a palindrome (43344344344334).

The spelling of 31212113223121 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirteen million, two hundred twenty-three thousand, one hundred twenty-one".