21049058 has 4 divisors (see below), whose sum is σ = 31573590. Its totient is φ = 10524528.

The previous prime is 21049027. The next prime is 21049103. The reversal of 21049058 is 85094012.

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., 12794929 + 8254129 = 3577^2 + 2873^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21049058.

It is an unprimeable number.

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, 5262263 + ... + 5262266.

Almost surely, 2^21049058 is an apocalyptic number.

21049058 is a deficient number, since it is larger than the sum of its proper divisors (10524532).

21049058 is a wasteful number, since it uses less digits than its factorization.

21049058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10524531.

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

The square root of 21049058 is about 4587.9252391468. The cubic root of 21049058 is about 276.1070875494.

The spelling of 21049058 in words is "twenty-one million, forty-nine thousand, fifty-eight".