21582775348 has 6 divisors (see below), whose sum is σ = 37769856866. Its totient is φ = 10791387672.

The previous prime is 21582775343. The next prime is 21582775349. The reversal of 21582775348 is 84357728512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17724129424 + 3858645924 = 133132^2 + 62118^2 .

It is a super-2 number, since 2×21582775348² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21582775295 and 21582775304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21582775343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2697846915 + ... + 2697846922.

Almost surely, 2^21582775348 is an apocalyptic number.

It is an amenable number.

21582775348 is a deficient number, since it is larger than the sum of its proper divisors (16187081518).

21582775348 is a wasteful number, since it uses less digits than its factorization.

21582775348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5395693841 (or 5395693839 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 52.

The spelling of 21582775348 in words is "twenty-one billion, five hundred eighty-two million, seven hundred seventy-five thousand, three hundred forty-eight".