1221212210107 has 4 divisors (see below), whose sum is σ = 1221218587296. Its totient is φ = 1221205832920.

The previous prime is 1221212210077. The next prime is 1221212210149. The reversal of 1221212210107 is 7010122121221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1221212210107 is a prime.

It is a super-2 number, since 2×1221212210107² (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 (1221212210167) 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, 2892163 + ... + 3287404.

It is an arithmetic number, because the mean of its divisors is an integer number (305304646824).

Almost surely, 2^{1221212210107} is an apocalyptic number.

1221212210107 is a deficient number, since it is larger than the sum of its proper divisors (6377189).

1221212210107 is an equidigital number, since it uses as much as digits as its factorization.

1221212210107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377188.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 1221212210107 its reverse (7010122121221), we get a palindrome (8231334331328).

The spelling of 1221212210107 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred seven".