21106506201611 has 2 divisors, whose sum is σ = 21106506201612. Its totient is φ = 21106506201610.

The previous prime is 21106506201601. The next prime is 21106506201659. The reversal of 21106506201611 is 11610260560112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21106506201611 - 2²² = 21106502007307 is a prime.

It is not a weakly prime, because it can be changed into another prime (21106506201601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10553253100805 + 10553253100806.

It is an arithmetic number, because the mean of its divisors is an integer number (10553253100806).

Almost surely, 2^{21106506201611} is an apocalyptic number.

21106506201611 is a deficient number, since it is larger than the sum of its proper divisors (1).

21106506201611 is an equidigital number, since it uses as much as digits as its factorization.

21106506201611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 21106506201611 its reverse (11610260560112), we get a palindrome (32716766761723).

The spelling of 21106506201611 in words is "twenty-one trillion, one hundred six billion, five hundred six million, two hundred one thousand, six hundred eleven".