21166058 has 8 divisors (see below), whose sum is σ = 32184228. Its totient is φ = 10437984.

The previous prime is 21166051. The next prime is 21166099. The reversal of 21166058 is 85066112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 1247689 = 4463^2 + 1117^2 .

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

It is a super-2 number, since 2×21166058² = 896004022518728, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21166058.

It is not an unprimeable number, because it can be changed into a prime (21166051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72341 + ... + 72632.

Almost surely, 2^21166058 is an apocalyptic number.

21166058 is a deficient number, since it is larger than the sum of its proper divisors (11018170).

21166058 is a wasteful number, since it uses less digits than its factorization.

21166058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145048.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21166058 is about 4600.6584311379. The cubic root of 21166058 is about 276.6177178286.

The spelling of 21166058 in words is "twenty-one million, one hundred sixty-six thousand, fifty-eight".