21029529 has 8 divisors (see below), whose sum is σ = 28060960. Its totient is φ = 14008896.

The previous prime is 21029483. The next prime is 21029551. The reversal of 21029529 is 92592012.

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

It is not a de Polignac number, because 21029529 - 2⁷ = 21029401 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21029496 and 21029505.

It is not an unprimeable number, because it can be changed into a prime (21021529) 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, 4929 + ... + 8145.

It is an arithmetic number, because the mean of its divisors is an integer number (3507620).

Almost surely, 2^21029529 is an apocalyptic number.

It is an amenable number.

21029529 is a deficient number, since it is larger than the sum of its proper divisors (7031431).

21029529 is a wasteful number, since it uses less digits than its factorization.

21029529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 21029529 is about 4585.7964411866. The cubic root of 21029529 is about 276.0216717912.

The spelling of 21029529 in words is "twenty-one million, twenty-nine thousand, five hundred twenty-nine".