21120656163153 has 16 divisors (see below), whose sum is σ = 29825695941696. Its totient is φ = 13248487969280.

The previous prime is 21120656163151. The next prime is 21120656163161. The reversal of 21120656163153 is 35136165602112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21120656163153 - 2¹ = 21120656163151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21120656163151) 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 15 ways as a sum of consecutive naturals, for example, 57446943 + ... + 57813428.

It is an arithmetic number, because the mean of its divisors is an integer number (1864105996356).

Almost surely, 2^{21120656163153} is an apocalyptic number.

It is an amenable number.

21120656163153 is a deficient number, since it is larger than the sum of its proper divisors (8705039778543).

21120656163153 is a wasteful number, since it uses less digits than its factorization.

21120656163153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115263984.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 21120656163153 in words is "twenty-one trillion, one hundred twenty billion, six hundred fifty-six million, one hundred sixty-three thousand, one hundred fifty-three".