21233646355 has 16 divisors (see below), whose sum is σ = 25749424800. Its totient is φ = 16807979520.

The previous prime is 21233646353. The next prime is 21233646377. The reversal of 21233646355 is 55364633212.

It is not a de Polignac number, because 21233646355 - 2¹ = 21233646353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21233646353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 376395 + ... + 429115.

It is an arithmetic number, because the mean of its divisors is an integer number (1609339050).

Almost surely, 2^21233646355 is an apocalyptic number.

21233646355 is a deficient number, since it is larger than the sum of its proper divisors (4515778445).

21233646355 is a wasteful number, since it uses less digits than its factorization.

21233646355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53574.

The product of its digits is 388800, while the sum is 40.

The spelling of 21233646355 in words is "twenty-one billion, two hundred thirty-three million, six hundred forty-six thousand, three hundred fifty-five".