21255361333 has 8 divisors (see below), whose sum is σ = 21576813440. Its totient is φ = 20934033120.

The previous prime is 21255361301. The next prime is 21255361363. The reversal of 21255361333 is 33316355212.

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 21255361333 - 2⁵ = 21255361301 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 (21255361363) 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, 349828 + ... + 406066.

It is an arithmetic number, because the mean of its divisors is an integer number (2697101680).

Almost surely, 2^21255361333 is an apocalyptic number.

It is an amenable number.

21255361333 is a deficient number, since it is larger than the sum of its proper divisors (321452107).

21255361333 is an equidigital number, since it uses as much as digits as its factorization.

21255361333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61947.

The product of its digits is 48600, while the sum is 34.

The spelling of 21255361333 in words is "twenty-one billion, two hundred fifty-five million, three hundred sixty-one thousand, three hundred thirty-three".