21775113149 has 2 divisors, whose sum is σ = 21775113150. Its totient is φ = 21775113148.

The previous prime is 21775113089. The next prime is 21775113211. The reversal of 21775113149 is 94131157712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21773068249 + 2044900 = 147557^2 + 1430^2 .

It is a cyclic number.

It is not a de Polignac number, because 21775113149 - 2²⁰ = 21774064573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21775113749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10887556574 + 10887556575.

It is an arithmetic number, because the mean of its divisors is an integer number (10887556575).

Almost surely, 2^21775113149 is an apocalyptic number.

It is an amenable number.

21775113149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21775113149 is an equidigital number, since it uses as much as digits as its factorization.

21775113149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 41.

The spelling of 21775113149 in words is "twenty-one billion, seven hundred seventy-five million, one hundred thirteen thousand, one hundred forty-nine".