21529058 has 16 divisors (see below), whose sum is σ = 33808320. Its totient is φ = 10262736.

The previous prime is 21529051. The next prime is 21529061. The reversal of 21529058 is 85092512.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21529051) 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, 18716 + ... + 19832.

It is an arithmetic number, because the mean of its divisors is an integer number (2113020).

Almost surely, 2^21529058 is an apocalyptic number.

21529058 is a deficient number, since it is larger than the sum of its proper divisors (12279262).

21529058 is a wasteful number, since it uses less digits than its factorization.

21529058 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1561.

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 21529058 is about 4639.9415944600. The cubic root of 21529058 is about 278.1901033977.

The spelling of 21529058 in words is "twenty-one million, five hundred twenty-nine thousand, fifty-eight".