1201211212001 has 4 divisors (see below), whose sum is σ = 1201286037252. Its totient is φ = 1201136386752.

The previous prime is 1201211211983. The next prime is 1201211212067. The reversal of 1201211212001 is 1002121121021.

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 167784448225 + 1033426763776 = 409615^2 + 1016576^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201211212001 is a prime.

It is a super-2 number, since 2×1201211212001² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201211218001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37388540 + ... + 37420653.

It is an arithmetic number, because the mean of its divisors is an integer number (300321509313).

Almost surely, 2^{1201211212001} is an apocalyptic number.

It is an amenable number.

1201211212001 is a deficient number, since it is larger than the sum of its proper divisors (74825251).

1201211212001 is an equidigital number, since it uses as much as digits as its factorization.

1201211212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74825250.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1201211212001 its reverse (1002121121021), we get a palindrome (2203332333022).

The spelling of 1201211212001 in words is "one trillion, two hundred one billion, two hundred eleven million, two hundred twelve thousand, one".