21504665142653 has 96 divisors (see below), whose sum is σ = 29333193043968. Its totient is φ = 15532519564800.

The previous prime is 21504665142641. The next prime is 21504665142671. The reversal of 21504665142653 is 35624156640512.

It is not a de Polignac number, because 21504665142653 - 2⁴ = 21504665142637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21504665142673) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 629087000 + ... + 629121182.

It is an arithmetic number, because the mean of its divisors is an integer number (305554094208).

Almost surely, 2^{21504665142653} is an apocalyptic number.

It is an amenable number.

21504665142653 is a deficient number, since it is larger than the sum of its proper divisors (7828527901315).

21504665142653 is a wasteful number, since it uses less digits than its factorization.

21504665142653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35263 (or 35256 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 21504665142653 in words is "twenty-one trillion, five hundred four billion, six hundred sixty-five million, one hundred forty-two thousand, six hundred fifty-three".