1231212221201 has 2 divisors, whose sum is σ = 1231212221202. Its totient is φ = 1231212221200.

The previous prime is 1231212221171. The next prime is 1231212221207. The reversal of 1231212221201 is 1021222121321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 860300770576 + 370911450625 = 927524^2 + 609025^2 .

It is an emirp because it is prime and its reverse (1021222121321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231212221201 - 2²² = 1231208026897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1231212221207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615606110600 + 615606110601.

It is an arithmetic number, because the mean of its divisors is an integer number (615606110601).

Almost surely, 2^{1231212221201} is an apocalyptic number.

It is an amenable number.

1231212221201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231212221201 is an equidigital number, since it uses as much as digits as its factorization.

1231212221201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1231212221201 its reverse (1021222121321), we get a palindrome (2252434342522).

It can be divided in two parts, 12 and 31212221201, that added together give a palindrome (31212221213).

The spelling of 1231212221201 in words is "one trillion, two hundred thirty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred one".