21755035 has 8 divisors (see below), whose sum is σ = 26185536. Its totient is φ = 17351040.

The previous prime is 21755021. The next prime is 21755077. The reversal of 21755035 is 53055712.

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

It is not a de Polignac number, because 21755035 - 2⁵ = 21755003 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21754994 and 21755012.

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, 4771 + ... + 8140.

It is an arithmetic number, because the mean of its divisors is an integer number (3273192).

Almost surely, 2^21755035 is an apocalyptic number.

21755035 is a deficient number, since it is larger than the sum of its proper divisors (4430501).

21755035 is a wasteful number, since it uses less digits than its factorization.

21755035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13253.

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 21755035 is about 4664.2293039687. The cubic root of 21755035 is about 279.1600465745.

The spelling of 21755035 in words is "twenty-one million, seven hundred fifty-five thousand, thirty-five".