21953153 has 8 divisors (see below), whose sum is σ = 22433472. Its totient is φ = 21477456.

The previous prime is 21953149. The next prime is 21953161. The reversal of 21953153 is 35135912.

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 21953153 - 2² = 21953149 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21953143) 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, 9476 + ... + 11562.

It is an arithmetic number, because the mean of its divisors is an integer number (2804184).

Almost surely, 2^21953153 is an apocalyptic number.

It is an amenable number.

21953153 is a deficient number, since it is larger than the sum of its proper divisors (480319).

21953153 is a wasteful number, since it uses less digits than its factorization.

21953153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311.

The product of its digits is 4050, while the sum is 29.

The square root of 21953153 is about 4685.4191914918. The cubic root of 21953153 is about 280.0049021251.

The spelling of 21953153 in words is "twenty-one million, nine hundred fifty-three thousand, one hundred fifty-three".