21101012200111 has 2 divisors, whose sum is σ = 21101012200112. Its totient is φ = 21101012200110.

The previous prime is 21101012199887. The next prime is 21101012200207. The reversal of 21101012200111 is 11100221010112.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21101012200111 - 2¹⁵ = 21101012167343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21101012200091 and 21101012200100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101012200711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550506100055 + 10550506100056.

It is an arithmetic number, because the mean of its divisors is an integer number (10550506100056).

Almost surely, 2^{21101012200111} is an apocalyptic number.

21101012200111 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101012200111 is an equidigital number, since it uses as much as digits as its factorization.

21101012200111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21101012200111 its reverse (11100221010112), we get a palindrome (32201233210223).

The spelling of 21101012200111 in words is "twenty-one trillion, one hundred one billion, twelve million, two hundred thousand, one hundred eleven".