21353055 has 16 divisors (see below), whose sum is σ = 35963520. Its totient is φ = 10788768.

The previous prime is 21353053. The next prime is 21353063. The reversal of 21353055 is 55035312.

It is not a de Polignac number, because 21353055 - 2¹ = 21353053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353051) 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, 37177 + ... + 37746.

It is an arithmetic number, because the mean of its divisors is an integer number (2247720).

Almost surely, 2^21353055 is an apocalyptic number.

21353055 is a deficient number, since it is larger than the sum of its proper divisors (14610465).

21353055 is a wasteful number, since it uses less digits than its factorization.

21353055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74950.

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

The square root of 21353055 is about 4620.9365933758. The cubic root of 21353055 is about 277.4299474175.

Adding to 21353055 its reverse (55035312), we get a palindrome (76388367).

The spelling of 21353055 in words is "twenty-one million, three hundred fifty-three thousand, fifty-five".