21035055 has 32 divisors (see below), whose sum is σ = 34933248. Its totient is φ = 10800000.

The previous prime is 21035029. The next prime is 21035059. The reversal of 21035055 is 55053012.

It is not a de Polignac number, because 21035055 - 2⁹ = 21034543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83680 + ... + 83930.

It is an arithmetic number, because the mean of its divisors is an integer number (1091664).

Almost surely, 2^21035055 is an apocalyptic number.

21035055 is a deficient number, since it is larger than the sum of its proper divisors (13898193).

21035055 is a wasteful number, since it uses less digits than its factorization.

21035055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447.

The product of its (nonzero) digits is 750, while the sum is 21.

The square root of 21035055 is about 4586.3989141809. The cubic root of 21035055 is about 276.0458467212.

Adding to 21035055 its reverse (55053012), we get a palindrome (76088067).

The spelling of 21035055 in words is "twenty-one million, thirty-five thousand, fifty-five".