21059004 has 24 divisors (see below), whose sum is σ = 49230720. Its totient is φ = 7006384.

The previous prime is 21058997. The next prime is 21059021. The reversal of 21059004 is 40095012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6577 + ... + 9239.

It is an arithmetic number, because the mean of its divisors is an integer number (2051280).

Almost surely, 2^21059004 is an apocalyptic number.

It is an amenable number.

21059004 is an abundant number, since it is smaller than the sum of its proper divisors (28171716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21059004 is a wasteful number, since it uses less digits than its factorization.

21059004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3329 (or 3327 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 21059004 is about 4589.0090433557. The cubic root of 21059004 is about 276.1505689674.

The spelling of 21059004 in words is "twenty-one million, fifty-nine thousand, four".