21573105 has 8 divisors (see below), whose sum is σ = 34516992. Its totient is φ = 11505648.

The previous prime is 21573089. The next prime is 21573121. The reversal of 21573105 is 50137512.

It is an interprime number because it is at equal distance from previous prime (21573089) and next prime (21573121).

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

It is not a de Polignac number, because 21573105 - 2⁴ = 21573089 is a prime.

It is a Curzon number.

It is an unprimeable number.

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, 719089 + ... + 719118.

It is an arithmetic number, because the mean of its divisors is an integer number (4314624).

Almost surely, 2^21573105 is an apocalyptic number.

It is an amenable number.

21573105 is a deficient number, since it is larger than the sum of its proper divisors (12943887).

21573105 is a wasteful number, since it uses less digits than its factorization.

21573105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1438215.

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 21573105 is about 4644.6856728954. The cubic root of 21573105 is about 278.3796935537.

The spelling of 21573105 in words is "twenty-one million, five hundred seventy-three thousand, one hundred five".