21655304440113 has 32 divisors (see below), whose sum is σ = 30050796787200. Its totient is φ = 13863644575616.

The previous prime is 21655304440093. The next prime is 21655304440129. The reversal of 21655304440113 is 31104440355612.

It is a cyclic number.

It is not a de Polignac number, because 21655304440113 - 2¹⁶ = 21655304374577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21655304440163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6973695 + ... + 9588692.

It is an arithmetic number, because the mean of its divisors is an integer number (939087399600).

Almost surely, 2^{21655304440113} is an apocalyptic number.

It is an amenable number.

21655304440113 is a deficient number, since it is larger than the sum of its proper divisors (8395492347087).

21655304440113 is a wasteful number, since it uses less digits than its factorization.

21655304440113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16562621.

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 21655304440113 its reverse (31104440355612), we get a palindrome (52759744795725).

The spelling of 21655304440113 in words is "twenty-one trillion, six hundred fifty-five billion, three hundred four million, four hundred forty thousand, one hundred thirteen".