21754005 has 32 divisors (see below), whose sum is σ = 42841344. Its totient is φ = 9179136.

The previous prime is 21753989. The next prime is 21754013. The reversal of 21754005 is 50045712.

It is not a de Polignac number, because 21754005 - 2⁴ = 21753989 is a prime.

It is a congruent 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 31 ways as a sum of consecutive naturals, for example, 6604 + ... + 9333.

It is an arithmetic number, because the mean of its divisors is an integer number (1338792).

Almost surely, 2^21754005 is an apocalyptic number.

It is an amenable number.

21754005 is a deficient number, since it is larger than the sum of its proper divisors (21087339).

21754005 is a wasteful number, since it uses less digits than its factorization.

21754005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15965.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 21754005 is about 4664.1188878501. The cubic root of 21754005 is about 279.1556408605.

Adding to 21754005 its reverse (50045712), we get a palindrome (71799717).

The spelling of 21754005 in words is "twenty-one million, seven hundred fifty-four thousand, five".