21755310351 has 8 divisors (see below), whose sum is σ = 29041089840. Its totient is φ = 14486535552.

The previous prime is 21755310323. The next prime is 21755310361. The reversal of 21755310351 is 15301355712.

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

It is not a de Polignac number, because 21755310351 - 2⁵ = 21755310319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21755310361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4248186 + ... + 4253303.

It is an arithmetic number, because the mean of its divisors is an integer number (3630136230).

Almost surely, 2^21755310351 is an apocalyptic number.

21755310351 is a deficient number, since it is larger than the sum of its proper divisors (7285779489).

21755310351 is an equidigital number, since it uses as much as digits as its factorization.

21755310351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8502345.

The product of its (nonzero) digits is 15750, while the sum is 33.

The spelling of 21755310351 in words is "twenty-one billion, seven hundred fifty-five million, three hundred ten thousand, three hundred fifty-one".