21183145 has 8 divisors (see below), whose sum is σ = 25522560. Its totient is φ = 16878000.

The previous prime is 21183121. The next prime is 21183167. The reversal of 21183145 is 54138112.

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

It is not a de Polignac number, because 21183145 - 2⁷ = 21183017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7185 + ... + 9694.

It is an arithmetic number, because the mean of its divisors is an integer number (3190320).

Almost surely, 2^21183145 is an apocalyptic number.

It is an amenable number.

21183145 is a deficient number, since it is larger than the sum of its proper divisors (4339415).

21183145 is a wasteful number, since it uses less digits than its factorization.

21183145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17135.

The product of its digits is 960, while the sum is 25.

The square root of 21183145 is about 4602.5150733050. The cubic root of 21183145 is about 276.6921340728.

The spelling of 21183145 in words is "twenty-one million, one hundred eighty-three thousand, one hundred forty-five".