21032449 has 8 divisors (see below), whose sum is σ = 22407840. Its totient is φ = 19683936.

The previous prime is 21032447. The next prime is 21032471. The reversal of 21032449 is 94423012.

21032449 = T₆₇₀ + T₆₇₁ + ... + T₇₅₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21032449 - 2¹ = 21032447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21032441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5092 + ... + 8245.

It is an arithmetic number, because the mean of its divisors is an integer number (2800980).

Almost surely, 2^21032449 is an apocalyptic number.

It is an amenable number.

21032449 is a deficient number, since it is larger than the sum of its proper divisors (1375391).

21032449 is a wasteful number, since it uses less digits than its factorization.

21032449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13439.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21032449 is about 4586.1148044941. The cubic root of 21032449 is about 276.0344466213.

The spelling of 21032449 in words is "twenty-one million, thirty-two thousand, four hundred forty-nine".