21011022123211 has 2 divisors, whose sum is σ = 21011022123212. Its totient is φ = 21011022123210.

The previous prime is 21011022123181. The next prime is 21011022123233. The reversal of 21011022123211 is 11232122011012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21011022123211 - 2⁷ = 21011022123083 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011022123271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505511061605 + 10505511061606.

It is an arithmetic number, because the mean of its divisors is an integer number (10505511061606).

Almost surely, 2^{21011022123211} is an apocalyptic number.

21011022123211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011022123211 is an equidigital number, since it uses as much as digits as its factorization.

21011022123211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21011022123211 its reverse (11232122011012), we get a palindrome (32243144134223).

The spelling of 21011022123211 in words is "twenty-one trillion, eleven billion, twenty-two million, one hundred twenty-three thousand, two hundred eleven".