21211110111941 has 2 divisors, whose sum is σ = 21211110111942. Its totient is φ = 21211110111940.

The previous prime is 21211110111931. The next prime is 21211110112013. The reversal of 21211110111941 is 14911101111212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17913599142916 + 3297510969025 = 4232446^2 + 1815905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21211110111941 is a prime.

It is a super-2 number, since 2×21211110111941² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21211110111941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21211110111931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605555055970 + 10605555055971.

It is an arithmetic number, because the mean of its divisors is an integer number (10605555055971).

Almost surely, 2^{21211110111941} is an apocalyptic number.

It is an amenable number.

21211110111941 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211110111941 is an equidigital number, since it uses as much as digits as its factorization.

21211110111941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 26.

The spelling of 21211110111941 in words is "twenty-one trillion, two hundred eleven billion, one hundred ten million, one hundred eleven thousand, nine hundred forty-one".