21201004 has 24 divisors (see below), whose sum is σ = 40755456. Its totient is φ = 9570000.

The previous prime is 21200987. The next prime is 21201031. The reversal of 21201004 is 40010212.

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, 5049 + ... + 8239.

It is an arithmetic number, because the mean of its divisors is an integer number (1698144).

Almost surely, 2^21201004 is an apocalyptic number.

It is an amenable number.

21201004 is a deficient number, since it is larger than the sum of its proper divisors (19554452).

21201004 is a wasteful number, since it uses less digits than its factorization.

21201004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3357 (or 3355 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21201004 is about 4604.4547994307. The cubic root of 21201004 is about 276.7698697254.

Adding to 21201004 its reverse (40010212), we get a palindrome (61211216).

The spelling of 21201004 in words is "twenty-one million, two hundred one thousand, four".