1212212220001 has 4 divisors (see below), whose sum is σ = 1212256358404. Its totient is φ = 1212168081600.

The previous prime is 1212212219927. The next prime is 1212212220017. The reversal of 1212212220001 is 1000222122121.

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 706583142225 + 505629077776 = 840585^2 + 711076^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212212220001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212212220071) 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, 22027980 + ... + 22082941.

It is an arithmetic number, because the mean of its divisors is an integer number (303064089601).

Almost surely, 2^{1212212220001} is an apocalyptic number.

It is an amenable number.

1212212220001 is a deficient number, since it is larger than the sum of its proper divisors (44138403).

1212212220001 is an equidigital number, since it uses as much as digits as its factorization.

1212212220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44138402.

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

Adding to 1212212220001 its reverse (1000222122121), we get a palindrome (2212434342122).

The spelling of 1212212220001 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred twenty thousand, one".