21035355 has 16 divisors (see below), whose sum is σ = 36716544. Its totient is φ = 10198880.

The previous prime is 21035327. The next prime is 21035359. The reversal of 21035355 is 55353012.

It is not a de Polignac number, because 21035355 - 2⁷ = 21035227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21035359) 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, 63579 + ... + 63908.

It is an arithmetic number, because the mean of its divisors is an integer number (2294784).

Almost surely, 2^21035355 is an apocalyptic number.

21035355 is a deficient number, since it is larger than the sum of its proper divisors (15681189).

21035355 is a wasteful number, since it uses less digits than its factorization.

21035355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127506.

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 21035355 is about 4586.4316194619. The cubic root of 21035355 is about 276.0471590284.

Adding to 21035355 its reverse (55353012), we get a palindrome (76388367).

The spelling of 21035355 in words is "twenty-one million, thirty-five thousand, three hundred fifty-five".