201211231300021 has 4 divisors (see below), whose sum is σ = 201211259776492. Its totient is φ = 201211202823552.

The previous prime is 201211231300007. The next prime is 201211231300033. The reversal of 201211231300021 is 120003132112102.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 74507729549796 + 126703501750225 = 8631786^2 + 11256265^2 .

It is a cyclic number.

It is not a de Polignac number, because 201211231300021 - 2⁴¹ = 199012208044469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211231300921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5272165 + ... + 20741701.

It is an arithmetic number, because the mean of its divisors is an integer number (50302814944123).

Almost surely, 2^{201211231300021} is an apocalyptic number.

It is an amenable number.

201211231300021 is a deficient number, since it is larger than the sum of its proper divisors (28476471).

201211231300021 is a wasteful number, since it uses less digits than its factorization.

201211231300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28476470.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 201211231300021 its reverse (120003132112102), we get a palindrome (321214363412123).

The spelling of 201211231300021 in words is "two hundred one trillion, two hundred eleven billion, two hundred thirty-one million, three hundred thousand, twenty-one".