21311300213201 has 4 divisors (see below), whose sum is σ = 21311341555812. Its totient is φ = 21311258870592.

The previous prime is 21311300213171. The next prime is 21311300213213. The reversal of 21311300213201 is 10231200311312.

It is a happy number.

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 14262700006801 + 7048600206400 = 3776599^2 + 2654920^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311300213201 - 2¹⁸ = 21311299951057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21311300212201) 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, 19888196 + ... + 20932341.

It is an arithmetic number, because the mean of its divisors is an integer number (5327835388953).

Almost surely, 2^{21311300213201} is an apocalyptic number.

It is an amenable number.

21311300213201 is a deficient number, since it is larger than the sum of its proper divisors (41342611).

21311300213201 is an equidigital number, since it uses as much as digits as its factorization.

21311300213201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41342610.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21311300213201 its reverse (10231200311312), we get a palindrome (31542500524513).

The spelling of 21311300213201 in words is "twenty-one trillion, three hundred eleven billion, three hundred million, two hundred thirteen thousand, two hundred one".