21529006 has 4 divisors (see below), whose sum is σ = 32293512. Its totient is φ = 10764502.

The previous prime is 21529003. The next prime is 21529007. The reversal of 21529006 is 60092512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21529003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5382250 + ... + 5382253.

It is an arithmetic number, because the mean of its divisors is an integer number (8073378).

Almost surely, 2^21529006 is an apocalyptic number.

21529006 is a deficient number, since it is larger than the sum of its proper divisors (10764506).

21529006 is a wasteful number, since it uses less digits than its factorization.

21529006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10764505.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21529006 is about 4639.9359909378. The cubic root of 21529006 is about 278.1898794229.

The spelling of 21529006 in words is "twenty-one million, five hundred twenty-nine thousand, six".