21200311213 has 2 divisors, whose sum is σ = 21200311214. Its totient is φ = 21200311212.

The previous prime is 21200311183. The next prime is 21200311229. The reversal of 21200311213 is 31211300212.

It is an a-pointer prime, because the next prime (21200311229) can be obtained adding 21200311213 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14685077124 + 6515234089 = 121182^2 + 80717^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200311213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21200311273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600155606 + 10600155607.

It is an arithmetic number, because the mean of its divisors is an integer number (10600155607).

Almost surely, 2^21200311213 is an apocalyptic number.

It is an amenable number.

21200311213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21200311213 is an equidigital number, since it uses as much as digits as its factorization.

21200311213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21200311213 its reverse (31211300212), we get a palindrome (52411611425).

The spelling of 21200311213 in words is "twenty-one billion, two hundred million, three hundred eleven thousand, two hundred thirteen".