21335245455 has 8 divisors (see below), whose sum is σ = 34136392752. Its totient is φ = 11378797568.

The previous prime is 21335245423. The next prime is 21335245489. The reversal of 21335245455 is 55454253312.

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 21335245455 - 2⁵ = 21335245423 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 711174834 + ... + 711174863.

It is an arithmetic number, because the mean of its divisors is an integer number (4267049094).

Almost surely, 2^21335245455 is an apocalyptic number.

21335245455 is a deficient number, since it is larger than the sum of its proper divisors (12801147297).

21335245455 is a wasteful number, since it uses less digits than its factorization.

21335245455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422349705.

The product of its digits is 360000, while the sum is 39.

Adding to 21335245455 its reverse (55454253312), we get a palindrome (76789498767).

The spelling of 21335245455 in words is "twenty-one billion, three hundred thirty-five million, two hundred forty-five thousand, four hundred fifty-five".