21435055 has 16 divisors (see below), whose sum is σ = 26780544. Its totient is φ = 16456960.

The previous prime is 21435049. The next prime is 21435061. The reversal of 21435055 is 55053412.

It is an interprime number because it is at equal distance from previous prime (21435049) and next prime (21435061).

It is not a de Polignac number, because 21435055 - 2⁵ = 21435023 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 11595 + ... + 13315.

It is an arithmetic number, because the mean of its divisors is an integer number (1673784).

Almost surely, 2^21435055 is an apocalyptic number.

21435055 is a deficient number, since it is larger than the sum of its proper divisors (5345489).

21435055 is a wasteful number, since it uses less digits than its factorization.

21435055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 21435055 is about 4629.8007516523. The cubic root of 21435055 is about 277.7846226165.

Adding to 21435055 its reverse (55053412), we get a palindrome (76488467).

The spelling of 21435055 in words is "twenty-one million, four hundred thirty-five thousand, fifty-five".