21059349 has 4 divisors (see below), whose sum is σ = 28079136. Its totient is φ = 14039564.

The previous prime is 21059347. The next prime is 21059369. The reversal of 21059349 is 94395012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21059349 - 2¹ = 21059347 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21059347) 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, 3509889 + ... + 3509894.

It is an arithmetic number, because the mean of its divisors is an integer number (7019784).

Almost surely, 2^21059349 is an apocalyptic number.

It is an amenable number.

21059349 is a deficient number, since it is larger than the sum of its proper divisors (7019787).

21059349 is an equidigital number, since it uses as much as digits as its factorization.

21059349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7019786.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 21059349 is about 4589.0466330165. The cubic root of 21059349 is about 276.1520769752.

The spelling of 21059349 in words is "twenty-one million, fifty-nine thousand, three hundred forty-nine".