1201212222001 has 4 divisors (see below), whose sum is σ = 1310413333104. Its totient is φ = 1092011110900.

The previous prime is 1201212221983. The next prime is 1201212222011. The reversal of 1201212222001 is 1002222121021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1201212222001 - 2⁵ = 1201212221969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201212222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54600555535 + ... + 54600555556.

It is an arithmetic number, because the mean of its divisors is an integer number (327603333276).

Almost surely, 2^{1201212222001} is an apocalyptic number.

1201212222001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201212222001 is a deficient number, since it is larger than the sum of its proper divisors (109201111103).

1201212222001 is a wasteful number, since it uses less digits than its factorization.

1201212222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109201111102.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1201212222001 its reverse (1002222121021), we get a palindrome (2203434343022).

It can be divided in two parts, 120 and 1212222001, that added together give a palindrome (1212222121).

The spelling of 1201212222001 in words is "one trillion, two hundred one billion, two hundred twelve million, two hundred twenty-two thousand, one".