21541004 has 12 divisors (see below), whose sum is σ = 37732464. Its totient is φ = 10760304.

The previous prime is 21540983. The next prime is 21541019. The reversal of 21541004 is 40014512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4169 + ... + 7775.

It is an arithmetic number, because the mean of its divisors is an integer number (3144372).

Almost surely, 2^21541004 is an apocalyptic number.

It is an amenable number.

21541004 is a deficient number, since it is larger than the sum of its proper divisors (16191460).

21541004 is a wasteful number, since it uses less digits than its factorization.

21541004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5104 (or 5102 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 21541004 is about 4641.2287166224. The cubic root of 21541004 is about 278.2415477370.

Adding to 21541004 its reverse (40014512), we get a palindrome (61555516).

The spelling of 21541004 in words is "twenty-one million, five hundred forty-one thousand, four".