21334056615 has 40 divisors (see below), whose sum is σ = 40256090160. Its totient is φ = 10779308928.

The previous prime is 21334056607. The next prime is 21334056637. The reversal of 21334056615 is 51665043312.

21334056615 is a `hidden beast` number, since 2 + 1 + 3 + 34 + 0 + 5 + 6 + 615 = 666.

It is not a de Polignac number, because 21334056615 - 2³ = 21334056607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21334056615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1378534 + ... + 1393923.

It is an arithmetic number, because the mean of its divisors is an integer number (1006402254).

Almost surely, 2^21334056615 is an apocalyptic number.

21334056615 is a deficient number, since it is larger than the sum of its proper divisors (18922033545).

21334056615 is a wasteful number, since it uses less digits than its factorization.

21334056615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772493 (or 2772484 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

Adding to 21334056615 its reverse (51665043312), we get a palindrome (72999099927).

The spelling of 21334056615 in words is "twenty-one billion, three hundred thirty-four million, fifty-six thousand, six hundred fifteen".