21153312165121 has 8 divisors (see below), whose sum is σ = 21201391886400. Its totient is φ = 21105258018000.

The previous prime is 21153312165107. The next prime is 21153312165131. The reversal of 21153312165121 is 12156121335112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21153312165121 - 2¹⁹ = 21153311640833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21153312165101) 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 7 ways as a sum of consecutive naturals, for example, 4736901 + ... + 8046418.

It is an arithmetic number, because the mean of its divisors is an integer number (2650173985800).

Almost surely, 2^{21153312165121} is an apocalyptic number.

It is an amenable number.

21153312165121 is a deficient number, since it is larger than the sum of its proper divisors (48079721279).

21153312165121 is a wasteful number, since it uses less digits than its factorization.

21153312165121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12787079.

The product of its digits is 10800, while the sum is 34.

The spelling of 21153312165121 in words is "twenty-one trillion, one hundred fifty-three billion, three hundred twelve million, one hundred sixty-five thousand, one hundred twenty-one".