3121211312201 has 4 divisors (see below), whose sum is σ = 3121333944852. Its totient is φ = 3121088679552.

The previous prime is 3121211312161. The next prime is 3121211312239. The reversal of 3121211312201 is 1022131121213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1566890580025 + 1554320732176 = 1251755^2 + 1246724^2 .

It is a cyclic number.

It is not a de Polignac number, because 3121211312201 - 2⁶ = 3121211312137 is a prime.

It is a super-2 number, since 2×3121211312201² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3121211362201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61278140 + ... + 61329053.

It is an arithmetic number, because the mean of its divisors is an integer number (780333486213).

Almost surely, 2^{3121211312201} is an apocalyptic number.

It is an amenable number.

3121211312201 is a deficient number, since it is larger than the sum of its proper divisors (122632651).

3121211312201 is a wasteful number, since it uses less digits than its factorization.

3121211312201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122632650.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 3121211312201 its reverse (1022131121213), we get a palindrome (4143342433414).

The spelling of 3121211312201 in words is "three trillion, one hundred twenty-one billion, two hundred eleven million, three hundred twelve thousand, two hundred one".