21531535110551 has 8 divisors (see below), whose sum is σ = 22692113713200. Its totient is φ = 20373690499200.

The previous prime is 21531535110529. The next prime is 21531535110583. The reversal of 21531535110551 is 15501153513512.

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 21531535110551 - 2¹⁰ = 21531535109527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531535115551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683481650 + ... + 683513151.

It is an arithmetic number, because the mean of its divisors is an integer number (2836514214150).

Almost surely, 2^{21531535110551} is an apocalyptic number.

21531535110551 is a deficient number, since it is larger than the sum of its proper divisors (1160578602649).

21531535110551 is a wasteful number, since it uses less digits than its factorization.

21531535110551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366995649.

The product of its (nonzero) digits is 56250, while the sum is 38.

The spelling of 21531535110551 in words is "twenty-one trillion, five hundred thirty-one billion, five hundred thirty-five million, one hundred ten thousand, five hundred fifty-one".