21771058 has 8 divisors (see below), whose sum is σ = 33351552. Its totient is φ = 10653876.

The previous prime is 21771053. The next prime is 21771077. The reversal of 21771058 is 85017712.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21771053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115710 + ... + 115897.

It is an arithmetic number, because the mean of its divisors is an integer number (4168944).

Almost surely, 2^21771058 is an apocalyptic number.

21771058 is a deficient number, since it is larger than the sum of its proper divisors (11580494).

21771058 is a wasteful number, since it uses less digits than its factorization.

21771058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231656.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 21771058 is about 4665.9466349284. The cubic root of 21771058 is about 279.2285653294.

The spelling of 21771058 in words is "twenty-one million, seven hundred seventy-one thousand, fifty-eight".