21240565334 has 16 divisors (see below), whose sum is σ = 32545152000. Its totient is φ = 10392270504.

The previous prime is 21240565331. The next prime is 21240565361. The reversal of 21240565334 is 43356504212.

It is a junction number, because it is equal to n+sod(n) for n = 21240565294 and 21240565303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240565331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 529517 + ... + 568215.

It is an arithmetic number, because the mean of its divisors is an integer number (2034072000).

Almost surely, 2^21240565334 is an apocalyptic number.

21240565334 is a deficient number, since it is larger than the sum of its proper divisors (11304586666).

21240565334 is a wasteful number, since it uses less digits than its factorization.

21240565334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44587.

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 21240565334 in words is "twenty-one billion, two hundred forty million, five hundred sixty-five thousand, three hundred thirty-four".