21155532014005 has 16 divisors (see below), whose sum is σ = 25410492115200. Its totient is φ = 16908528966912.

The previous prime is 21155532013961. The next prime is 21155532014047. The reversal of 21155532014005 is 50041023555112.

It is a cyclic number.

It is not a de Polignac number, because 21155532014005 - 2⁷ = 21155532013877 is a prime.

It is a super-2 number, since 2×21155532014005² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28933432 + ... + 29655598.

It is an arithmetic number, because the mean of its divisors is an integer number (1588155757200).

Almost surely, 2^{21155532014005} is an apocalyptic number.

It is an amenable number.

21155532014005 is a deficient number, since it is larger than the sum of its proper divisors (4254960101195).

21155532014005 is a wasteful number, since it uses less digits than its factorization.

21155532014005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727668.

The product of its (nonzero) digits is 30000, while the sum is 34.

Adding to 21155532014005 its reverse (50041023555112), we get a palindrome (71196555569117).

The spelling of 21155532014005 in words is "twenty-one trillion, one hundred fifty-five billion, five hundred thirty-two million, fourteen thousand, five".