21021211120211 has 2 divisors, whose sum is σ = 21021211120212. Its totient is φ = 21021211120210.

The previous prime is 21021211120201. The next prime is 21021211120267. The reversal of 21021211120211 is 11202111212012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021211120211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21021211120211.

It is not a weakly prime, because it can be changed into another prime (21021211120201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510605560105 + 10510605560106.

It is an arithmetic number, because the mean of its divisors is an integer number (10510605560106).

Almost surely, 2^{21021211120211} is an apocalyptic number.

21021211120211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21021211120211 is an equidigital number, since it uses as much as digits as its factorization.

21021211120211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21021211120211 its reverse (11202111212012), we get a palindrome (32223322332223).

The spelling of 21021211120211 in words is "twenty-one trillion, twenty-one billion, two hundred eleven million, one hundred twenty thousand, two hundred eleven".