21130312211 has 2 divisors, whose sum is σ = 21130312212. Its totient is φ = 21130312210.

The previous prime is 21130312157. The next prime is 21130312279. The reversal of 21130312211 is 11221303112.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21130312211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21130312211.

It is not a weakly prime, because it can be changed into another prime (21130312811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565156105 + 10565156106.

It is an arithmetic number, because the mean of its divisors is an integer number (10565156106).

Almost surely, 2^21130312211 is an apocalyptic number.

21130312211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130312211 is an equidigital number, since it uses as much as digits as its factorization.

21130312211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 21130312211 its reverse (11221303112), we get a palindrome (32351615323).

Subtracting from 21130312211 its reverse (11221303112), we obtain a palindrome (9909009099).

The spelling of 21130312211 in words is "twenty-one billion, one hundred thirty million, three hundred twelve thousand, two hundred eleven".