21789153 has 12 divisors (see below), whose sum is σ = 32143488. Its totient is φ = 14216760.

The previous prime is 21789151. The next prime is 21789167. The reversal of 21789153 is 35198712.

It is not a de Polignac number, because 21789153 - 2¹ = 21789151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21789151) 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 11 ways as a sum of consecutive naturals, for example, 25333 + ... + 26178.

It is an arithmetic number, because the mean of its divisors is an integer number (2678624).

Almost surely, 2^21789153 is an apocalyptic number.

It is an amenable number.

21789153 is a deficient number, since it is larger than the sum of its proper divisors (10354335).

21789153 is a wasteful number, since it uses less digits than its factorization.

21789153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51564 (or 51561 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 21789153 is about 4667.8852813667. The cubic root of 21789153 is about 279.3059041172.

The spelling of 21789153 in words is "twenty-one million, seven hundred eighty-nine thousand, one hundred fifty-three".