21076349 has 16 divisors (see below), whose sum is σ = 25386240. Its totient is φ = 17107200.

The previous prime is 21076343. The next prime is 21076361. The reversal of 21076349 is 94367012.

21076349 = 196² + 197² + ... + 413².

It is a cyclic number.

It is not a de Polignac number, because 21076349 - 2⁸ = 21076093 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16949 + ... + 18149.

It is an arithmetic number, because the mean of its divisors is an integer number (1586640).

Almost surely, 2^21076349 is an apocalyptic number.

It is an amenable number.

21076349 is a deficient number, since it is larger than the sum of its proper divisors (4309891).

21076349 is a wasteful number, since it uses less digits than its factorization.

21076349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21076349 is about 4590.8984959374. The cubic root of 21076349 is about 276.2263642138.

The spelling of 21076349 in words is "twenty-one million, seventy-six thousand, three hundred forty-nine".