1221212100107 has 2 divisors, whose sum is σ = 1221212100108. Its totient is φ = 1221212100106.

The previous prime is 1221212100077. The next prime is 1221212100127. The reversal of 1221212100107 is 7010012121221.

It is a happy number.

It is an a-pointer prime, because the next prime (1221212100127) can be obtained adding 1221212100107 to its sum of digits (20).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1221212100107 - 2⁸ = 1221212099851 is a prime.

It is a super-2 number, since 2×1221212100107² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1221212100127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610606050053 + 610606050054.

It is an arithmetic number, because the mean of its divisors is an integer number (610606050054).

Almost surely, 2^{1221212100107} is an apocalyptic number.

1221212100107 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221212100107 is an equidigital number, since it uses as much as digits as its factorization.

1221212100107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 1221212100107 its reverse (7010012121221), we get a palindrome (8231224221328).

The spelling of 1221212100107 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred thousand, one hundred seven".