21775549364 has 12 divisors (see below), whose sum is σ = 38205176100. Its totient is φ = 10859784768.

The previous prime is 21775549361. The next prime is 21775549379. The reversal of 21775549364 is 46394557712.

It can be written as a sum of positive squares in 2 ways, for example, as 9671148964 + 12104400400 = 98342^2 + 110020^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21775549361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6995729 + ... + 6998840.

It is an arithmetic number, because the mean of its divisors is an integer number (3183764675).

Almost surely, 2^21775549364 is an apocalyptic number.

It is an amenable number.

21775549364 is a deficient number, since it is larger than the sum of its proper divisors (16429626736).

21775549364 is a wasteful number, since it uses less digits than its factorization.

21775549364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13994962 (or 13994960 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 53.

The spelling of 21775549364 in words is "twenty-one billion, seven hundred seventy-five million, five hundred forty-nine thousand, three hundred sixty-four".