21131133211 has 2 divisors, whose sum is σ = 21131133212. Its totient is φ = 21131133210.

The previous prime is 21131133209. The next prime is 21131133223. The reversal of 21131133211 is 11233113112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21131133211 - 2¹ = 21131133209 is a prime.

Together with 21131133209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21131133511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565566605 + 10565566606.

It is an arithmetic number, because the mean of its divisors is an integer number (10565566606).

Almost surely, 2^21131133211 is an apocalyptic number.

21131133211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21131133211 is an equidigital number, since it uses as much as digits as its factorization.

21131133211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 19.

Adding to 21131133211 its reverse (11233113112), we get a palindrome (32364246323).

The spelling of 21131133211 in words is "twenty-one billion, one hundred thirty-one million, one hundred thirty-three thousand, two hundred eleven".