21101111149 has 2 divisors, whose sum is σ = 21101111150. Its totient is φ = 21101111148.

The previous prime is 21101111113. The next prime is 21101111159. The reversal of 21101111149 is 94111110112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11119702500 + 9981408649 = 105450^2 + 99907^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101111149 - 2¹⁷ = 21100980077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21101111159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550555574 + 10550555575.

It is an arithmetic number, because the mean of its divisors is an integer number (10550555575).

Almost surely, 2^21101111149 is an apocalyptic number.

It is an amenable number.

21101111149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21101111149 is an equidigital number, since it uses as much as digits as its factorization.

21101111149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 21101111149 in words is "twenty-one billion, one hundred one million, one hundred eleven thousand, one hundred forty-nine".