21353013755 has 16 divisors (see below), whose sum is σ = 25829220384. Its totient is φ = 16945443840.

The previous prime is 21353013743. The next prime is 21353013757. The reversal of 21353013755 is 55731035312.

It is not a de Polignac number, because 21353013755 - 2¹⁰ = 21353012731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21353013757) 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, 2364629 + ... + 2373641.

It is an arithmetic number, because the mean of its divisors is an integer number (1614326274).

Almost surely, 2^21353013755 is an apocalyptic number.

21353013755 is a deficient number, since it is larger than the sum of its proper divisors (4476206629).

21353013755 is a wasteful number, since it uses less digits than its factorization.

21353013755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12766.

The product of its (nonzero) digits is 47250, while the sum is 35.

The spelling of 21353013755 in words is "twenty-one billion, three hundred fifty-three million, thirteen thousand, seven hundred fifty-five".