21046529 has 6 divisors (see below), whose sum is σ = 24482754. Its totient is φ = 18039840.

The previous prime is 21046513. The next prime is 21046537. The reversal of 21046529 is 92564012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14554225 + 6492304 = 3815^2 + 2548^2 .

It is not a de Polignac number, because 21046529 - 2⁴ = 21046513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21046549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214712 + ... + 214809.

It is an arithmetic number, because the mean of its divisors is an integer number (4080459).

Almost surely, 2^21046529 is an apocalyptic number.

It is an amenable number.

21046529 is a deficient number, since it is larger than the sum of its proper divisors (3436225).

21046529 is an equidigital number, since it uses as much as digits as its factorization.

21046529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429535 (or 429528 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 21046529 is about 4587.6496160888. The cubic root of 21046529 is about 276.0960292114.

The spelling of 21046529 in words is "twenty-one million, forty-six thousand, five hundred twenty-nine".