31213203312121 has 8 divisors (see below), whose sum is σ = 31252507140960. Its totient is φ = 31173922520352.

The previous prime is 31213203312077. The next prime is 31213203312149. The reversal of 31213203312121 is 12121330231213.

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 31213203312121 - 2¹⁵ = 31213203279353 is a prime.

It is a super-2 number, since 2×31213203312121² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31213203315121) 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, 3046935 + ... + 8468188.

It is an arithmetic number, because the mean of its divisors is an integer number (3906563392620).

Almost surely, 2^{31213203312121} is an apocalyptic number.

It is an amenable number.

31213203312121 is a deficient number, since it is larger than the sum of its proper divisors (39303828839).

31213203312121 is a wasteful number, since it uses less digits than its factorization.

31213203312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11518535.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31213203312121 its reverse (12121330231213), we get a palindrome (43334533543334).

The spelling of 31213203312121 in words is "thirty-one trillion, two hundred thirteen billion, two hundred three million, three hundred twelve thousand, one hundred twenty-one".