21546004 has 12 divisors (see below), whose sum is σ = 39923604. Its totient is φ = 10139264.

The previous prime is 21546001. The next prime is 21546011. The reversal of 21546004 is 40064512.

It can be written as a sum of positive squares in 2 ways, for example, as 6708100 + 14837904 = 2590^2 + 3852^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21546001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158359 + ... + 158494.

It is an arithmetic number, because the mean of its divisors is an integer number (3326967).

Almost surely, 2^21546004 is an apocalyptic number.

It is an amenable number.

21546004 is a deficient number, since it is larger than the sum of its proper divisors (18377600).

21546004 is a wasteful number, since it uses less digits than its factorization.

21546004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316874 (or 316872 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 21546004 is about 4641.7673358323. The cubic root of 21546004 is about 278.2630741263.

The spelling of 21546004 in words is "twenty-one million, five hundred forty-six thousand, four".