21010529 has 8 divisors (see below), whose sum is σ = 22437120. Its totient is φ = 19630800.

The previous prime is 21010519. The next prime is 21010543. The reversal of 21010529 is 92501012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010529 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010529.

It is not an unprimeable number, because it can be changed into a prime (21010519) 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, 10787 + ... + 12584.

It is an arithmetic number, because the mean of its divisors is an integer number (2804640).

Almost surely, 2^21010529 is an apocalyptic number.

21010529 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21010529 is a deficient number, since it is larger than the sum of its proper divisors (1426591).

21010529 is a wasteful number, since it uses less digits than its factorization.

21010529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23431.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 21010529 is about 4583.7243590775. The cubic root of 21010529 is about 275.9385190019.

The spelling of 21010529 in words is "twenty-one million, ten thousand, five hundred twenty-nine".