21611121340364 has 24 divisors (see below), whose sum is σ = 38486583368688. Its totient is φ = 10616393200320.

The previous prime is 21611121340357. The next prime is 21611121340381. The reversal of 21611121340364 is 46304312111612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179756867 + ... + 179877050.

It is an arithmetic number, because the mean of its divisors is an integer number (1603607640362).

Almost surely, 2^{21611121340364} is an apocalyptic number.

It is an amenable number.

21611121340364 is a deficient number, since it is larger than the sum of its proper divisors (16875462028324).

21611121340364 is a wasteful number, since it uses less digits than its factorization.

21611121340364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359634185 (or 359634183 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

Adding to 21611121340364 its reverse (46304312111612), we get a palindrome (67915433451976).

The spelling of 21611121340364 in words is "twenty-one trillion, six hundred eleven billion, one hundred twenty-one million, three hundred forty thousand, three hundred sixty-four".