3121210121 has 8 divisors (see below), whose sum is σ = 3198492360. Its totient is φ = 3044609152.

The previous prime is 3121210117. The next prime is 3121210129. The reversal of 3121210121 is 1210121213.

It can be written as a sum of positive squares in 4 ways, for example, as 2039786896 + 1081423225 = 45164^2 + 32885^2 .

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 3121210121 - 2² = 3121210117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3121210096 and 3121210105.

It is not an unprimeable number, because it can be changed into a prime (3121210129) 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, 161036 + ... + 179373.

It is an arithmetic number, because the mean of its divisors is an integer number (399811545).

Almost surely, 2^3121210121 is an apocalyptic number.

It is an amenable number.

3121210121 is a deficient number, since it is larger than the sum of its proper divisors (77282239).

3121210121 is a wasteful number, since it uses less digits than its factorization.

3121210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340635.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 3121210121 is about 55867.7914455189. The cubic root of 3121210121 is about 1461.4176074397.

Adding to 3121210121 its reverse (1210121213), we get a palindrome (4331331334).

The spelling of 3121210121 in words is "three billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".