1212212110021 has 12 divisors (see below), whose sum is σ = 1332603594700. Its totient is φ = 1101868669440.

The previous prime is 1212212110001. The next prime is 1212212110097. The reversal of 1212212110021 is 1200112122121.

It can be written as a sum of positive squares in 2 ways, for example, as 250214045796 + 961998064225 = 500214^2 + 980815^2 .

It is not a de Polignac number, because 1212212110021 - 2⁵ = 1212212109989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212212109977 and 1212212110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212212110001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299365 + ... + 1585573.

Almost surely, 2^{1212212110021} is an apocalyptic number.

1212212110021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212212110021 is a deficient number, since it is larger than the sum of its proper divisors (120391484679).

1212212110021 is a wasteful number, since it uses less digits than its factorization.

1212212110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294020 (or 1294009 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212212110021 its reverse (1200112122121), we get a palindrome (2412324232142).

The spelling of 1212212110021 in words is "one trillion, two hundred twelve billion, two hundred twelve million, one hundred ten thousand, twenty-one".