21296355 has 16 divisors (see below), whose sum is σ = 34413984. Its totient is φ = 11244800.

The previous prime is 21296333. The next prime is 21296357. The reversal of 21296355 is 55369212.

It is not a de Polignac number, because 21296355 - 2⁵ = 21296323 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21296357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5514 + ... + 8543.

It is an arithmetic number, because the mean of its divisors is an integer number (2150874).

Almost surely, 2^21296355 is an apocalyptic number.

21296355 is a deficient number, since it is larger than the sum of its proper divisors (13117629).

21296355 is a wasteful number, since it uses less digits than its factorization.

21296355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14166.

The product of its digits is 16200, while the sum is 33.

The square root of 21296355 is about 4614.7973953360. The cubic root of 21296355 is about 277.1841711611.

The spelling of 21296355 in words is "twenty-one million, two hundred ninety-six thousand, three hundred fifty-five".