21752153 has 8 divisors (see below), whose sum is σ = 22311072. Its totient is φ = 21200256.

The previous prime is 21752141. The next prime is 21752177. The reversal of 21752153 is 35125712.

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 21752153 - 2¹⁰ = 21751129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21752113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4826 + ... + 8172.

It is an arithmetic number, because the mean of its divisors is an integer number (2788884).

Almost surely, 2^21752153 is an apocalyptic number.

It is an amenable number.

21752153 is a deficient number, since it is larger than the sum of its proper divisors (558919).

21752153 is an equidigital number, since it uses as much as digits as its factorization.

21752153 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3511.

The product of its digits is 2100, while the sum is 26.

The square root of 21752153 is about 4663.9203466612. The cubic root of 21752153 is about 279.1477187803.

Adding to 21752153 its reverse (35125712), we get a palindrome (56877865).

The spelling of 21752153 in words is "twenty-one million, seven hundred fifty-two thousand, one hundred fifty-three".