21241101811 has 2 divisors, whose sum is σ = 21241101812. Its totient is φ = 21241101810.

The previous prime is 21241101799. The next prime is 21241101863. The reversal of 21241101811 is 11810114212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21241101811 - 2⁵ = 21241101779 is a prime.

It is a super-2 number, since 2×21241101811² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21241102811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620550905 + 10620550906.

It is an arithmetic number, because the mean of its divisors is an integer number (10620550906).

Almost surely, 2^21241101811 is an apocalyptic number.

21241101811 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241101811 is an equidigital number, since it uses as much as digits as its factorization.

21241101811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 22.

The spelling of 21241101811 in words is "twenty-one billion, two hundred forty-one million, one hundred one thousand, eight hundred eleven".