21500121330611 has 64 divisors (see below), whose sum is σ = 28897620480000. Its totient is φ = 15831473535360.

The previous prime is 21500121330593. The next prime is 21500121330671. The reversal of 21500121330611 is 11603312100512.

It is not a de Polignac number, because 21500121330611 - 2²⁶ = 21500054221747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21500121330671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3052205 + ... + 7232993.

It is an arithmetic number, because the mean of its divisors is an integer number (451525320000).

Almost surely, 2^{21500121330611} is an apocalyptic number.

21500121330611 is a deficient number, since it is larger than the sum of its proper divisors (7397499149389).

21500121330611 is a wasteful number, since it uses less digits than its factorization.

21500121330611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4180897 (or 4180883 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

The spelling of 21500121330611 in words is "twenty-one trillion, five hundred billion, one hundred twenty-one million, three hundred thirty thousand, six hundred eleven".