21559153 has 16 divisors (see below), whose sum is σ = 27538560. Its totient is φ = 16387200.

The previous prime is 21559141. The next prime is 21559159. The reversal of 21559153 is 35195512.

It is a cyclic number.

It is not a de Polignac number, because 21559153 - 2⁵ = 21559121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21559159) 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, 258 + ... + 6571.

It is an arithmetic number, because the mean of its divisors is an integer number (1721160).

Almost surely, 2^21559153 is an apocalyptic number.

It is an amenable number.

21559153 is a deficient number, since it is larger than the sum of its proper divisors (5979407).

21559153 is a wasteful number, since it uses less digits than its factorization.

21559153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6888.

The product of its digits is 6750, while the sum is 31.

The square root of 21559153 is about 4643.1834984200. The cubic root of 21559153 is about 278.3196683344.

It can be divided in two parts, 21559 and 153, that added together give a palindrome (21712).

The spelling of 21559153 in words is "twenty-one million, five hundred fifty-nine thousand, one hundred fifty-three".