21911153 has 8 divisors (see below), whose sum is σ = 24727680. Its totient is φ = 19232080.

The previous prime is 21911143. The next prime is 21911159. The reversal of 21911153 is 35111912.

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 21911153 - 2⁴ = 21911137 is a prime.

It is a super-3 number, since 3×21911153³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21911159) 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, 34025 + ... + 34662.

It is an arithmetic number, because the mean of its divisors is an integer number (3090960).

Almost surely, 2^21911153 is an apocalyptic number.

It is an amenable number.

21911153 is a deficient number, since it is larger than the sum of its proper divisors (2816527).

21911153 is a wasteful number, since it uses less digits than its factorization.

21911153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68727.

The product of its digits is 270, while the sum is 23.

The square root of 21911153 is about 4680.9350561613. The cubic root of 21911153 is about 279.8262229530.

The spelling of 21911153 in words is "twenty-one million, nine hundred eleven thousand, one hundred fifty-three".