21740105 has 8 divisors (see below), whose sum is σ = 26288064. Its totient is φ = 17258800.

The previous prime is 21740101. The next prime is 21740137. The reversal of 21740105 is 50104712.

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

It is not a de Polignac number, because 21740105 - 2² = 21740101 is a prime.

It is a super-2 number, since 2×21740105² = 945264330822050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21740101) 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, 15941 + ... + 17250.

It is an arithmetic number, because the mean of its divisors is an integer number (3286008).

Almost surely, 2^21740105 is an apocalyptic number.

It is an amenable number.

21740105 is a deficient number, since it is larger than the sum of its proper divisors (4547959).

21740105 is a wasteful number, since it uses less digits than its factorization.

21740105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33327.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 21740105 is about 4662.6285505067. The cubic root of 21740105 is about 279.0961715023.

Adding to 21740105 its reverse (50104712), we get a palindrome (71844817).

The spelling of 21740105 in words is "twenty-one million, seven hundred forty thousand, one hundred five".