21352582730 has 8 divisors (see below), whose sum is σ = 38434648932. Its totient is φ = 8541033088.

The previous prime is 21352582687. The next prime is 21352582763. The reversal of 21352582730 is 3728525312.

It can be written as a sum of positive squares in 2 ways, for example, as 21061846129 + 290736601 = 145127^2 + 17051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1067629127 + ... + 1067629146.

Almost surely, 2^21352582730 is an apocalyptic number.

21352582730 is a deficient number, since it is larger than the sum of its proper divisors (17082066202).

21352582730 is a wasteful number, since it uses less digits than its factorization.

21352582730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135258280.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 21352582730 in words is "twenty-one billion, three hundred fifty-two million, five hundred eighty-two thousand, seven hundred thirty".