21739153 has 8 divisors (see below), whose sum is σ = 22498560. Its totient is φ = 20983440.

The previous prime is 21739129. The next prime is 21739189. The reversal of 21739153 is 35193712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21739153 - 2²¹ = 19642001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (21739103) 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 7 ways as a sum of consecutive naturals, for example, 16638 + ... + 17896.

It is an arithmetic number, because the mean of its divisors is an integer number (2812320).

Almost surely, 2^21739153 is an apocalyptic number.

It is an amenable number.

21739153 is a deficient number, since it is larger than the sum of its proper divisors (759407).

21739153 is a wasteful number, since it uses less digits than its factorization.

21739153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847.

The product of its digits is 5670, while the sum is 31.

The square root of 21739153 is about 4662.5264610509. The cubic root of 21739153 is about 279.0920975656.

The spelling of 21739153 in words is "twenty-one million, seven hundred thirty-nine thousand, one hundred fifty-three".