21202131211 has 2 divisors, whose sum is σ = 21202131212. Its totient is φ = 21202131210.

The previous prime is 21202131199. The next prime is 21202131221. The reversal of 21202131211 is 11213120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21202131211 - 2¹⁵ = 21202098443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21202131221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601065605 + 10601065606.

It is an arithmetic number, because the mean of its divisors is an integer number (10601065606).

Almost surely, 2^21202131211 is an apocalyptic number.

21202131211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202131211 is an equidigital number, since it uses as much as digits as its factorization.

21202131211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21202131211 its reverse (11213120212), we get a palindrome (32415251423).

The spelling of 21202131211 in words is "twenty-one billion, two hundred two million, one hundred thirty-one thousand, two hundred eleven".