21058379 has 16 divisors (see below), whose sum is σ = 22680000. Its totient is φ = 19514880.

The previous prime is 21058369. The next prime is 21058417. The reversal of 21058379 is 97385012.

It is a cyclic number.

It is not a de Polignac number, because 21058379 - 2⁸ = 21058123 is a prime.

It is a super-2 number, since 2×21058379² = 886910652215282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21058369) 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 15 ways as a sum of consecutive naturals, for example, 105722 + ... + 105920.

It is an arithmetic number, because the mean of its divisors is an integer number (1417500).

Almost surely, 2^21058379 is an apocalyptic number.

21058379 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

21058379 is a deficient number, since it is larger than the sum of its proper divisors (1621621).

21058379 is a wasteful number, since it uses less digits than its factorization.

21058379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 21058379 is about 4588.9409453598. The cubic root of 21058379 is about 276.1478370273.

The spelling of 21058379 in words is "twenty-one million, fifty-eight thousand, three hundred seventy-nine".