21160658 has 4 divisors (see below), whose sum is σ = 31740990. Its totient is φ = 10580328.

The previous prime is 21160651. The next prime is 21160673. The reversal of 21160658 is 85606112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17447329 + 3713329 = 4177^2 + 1927^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21160658.

It is not an unprimeable number, because it can be changed into a prime (21160651) 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 as a sum of consecutive naturals, namely, 5290163 + ... + 5290166.

Almost surely, 2^21160658 is an apocalyptic number.

21160658 is a deficient number, since it is larger than the sum of its proper divisors (10580332).

21160658 is a wasteful number, since it uses less digits than its factorization.

21160658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10580331.

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

The square root of 21160658 is about 4600.0715211831. The cubic root of 21160658 is about 276.5941917548.

The spelling of 21160658 in words is "twenty-one million, one hundred sixty thousand, six hundred fifty-eight".