21582749067 has 24 divisors (see below), whose sum is σ = 31646075328. Its totient is φ = 13074185520.

The previous prime is 21582749053. The next prime is 21582749161. The reversal of 21582749067 is 76094728512.

It is a happy number.

It is not a de Polignac number, because 21582749067 - 2¹² = 21582744971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21582749567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 809808 + ... + 836034.

It is an arithmetic number, because the mean of its divisors is an integer number (1318586472).

Almost surely, 2^21582749067 is an apocalyptic number.

21582749067 is a deficient number, since it is larger than the sum of its proper divisors (10063326261).

21582749067 is a wasteful number, since it uses less digits than its factorization.

21582749067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28519 (or 28508 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 21582749067 in words is "twenty-one billion, five hundred eighty-two million, seven hundred forty-nine thousand, sixty-seven".