20001212102021 has 4 divisors (see below), whose sum is σ = 20275201308972. Its totient is φ = 19727222895072.

The previous prime is 20001212101999. The next prime is 20001212102077. The reversal of 20001212102021 is 12020121210002.

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 5044003924996 + 14957208177025 = 2245886^2 + 3867455^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001212102021 - 2¹⁴ = 20001212085637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001212101987 and 20001212102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001212102621) 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, 136994603366 + ... + 136994603511.

It is an arithmetic number, because the mean of its divisors is an integer number (5068800327243).

Almost surely, 2^{20001212102021} is an apocalyptic number.

It is an amenable number.

20001212102021 is a deficient number, since it is larger than the sum of its proper divisors (273989206951).

20001212102021 is an equidigital number, since it uses as much as digits as its factorization.

20001212102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273989206950.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20001212102021 its reverse (12020121210002), we get a palindrome (32021333312023).

The spelling of 20001212102021 in words is "twenty trillion, one billion, two hundred twelve million, one hundred two thousand, twenty-one".