21755793 has 8 divisors (see below), whose sum is σ = 29129056. Its totient is φ = 14443200.

The previous prime is 21755761. The next prime is 21755803. The reversal of 21755793 is 39755712.

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

It is not a de Polignac number, because 21755793 - 2⁵ = 21755761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21755093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14323 + ... + 15768.

It is an arithmetic number, because the mean of its divisors is an integer number (3641132).

Almost surely, 2^21755793 is an apocalyptic number.

It is an amenable number.

21755793 is a deficient number, since it is larger than the sum of its proper divisors (7373263).

21755793 is a wasteful number, since it uses less digits than its factorization.

21755793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30335.

The product of its digits is 66150, while the sum is 39.

The square root of 21755793 is about 4664.3105599863. The cubic root of 21755793 is about 279.1632887490.

The spelling of 21755793 in words is "twenty-one million, seven hundred fifty-five thousand, seven hundred ninety-three".