1212120222001 has 4 divisors (see below), whose sum is σ = 1305360239092. Its totient is φ = 1118880204912.

The previous prime is 1212120221989. The next prime is 1212120222023. The reversal of 1212120222001 is 1002220212121.

It is a happy number.

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 215764895025 + 996355326976 = 464505^2 + 998176^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212120222001 - 2¹³ = 1212120213809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212120222091) 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, 46620008526 + ... + 46620008551.

It is an arithmetic number, because the mean of its divisors is an integer number (326340059773).

Almost surely, 2^{1212120222001} is an apocalyptic number.

It is an amenable number.

1212120222001 is a deficient number, since it is larger than the sum of its proper divisors (93240017091).

1212120222001 is an equidigital number, since it uses as much as digits as its factorization.

1212120222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93240017090.

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

Adding to 1212120222001 its reverse (1002220212121), we get a palindrome (2214340434122).

The spelling of 1212120222001 in words is "one trillion, two hundred twelve billion, one hundred twenty million, two hundred twenty-two thousand, one".