21504098 has 32 divisors (see below), whose sum is σ = 41084928. Its totient is φ = 8197200.

The previous prime is 21504097. The next prime is 21504107. The reversal of 21504098 is 89040512.

It is a self number, because there is not a number n which added to its sum of digits gives 21504098.

It is not an unprimeable number, because it can be changed into a prime (21504097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5753 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (1283904).

Almost surely, 2^21504098 is an apocalyptic number.

21504098 is a deficient number, since it is larger than the sum of its proper divisors (19580830).

21504098 is a wasteful number, since it uses less digits than its factorization.

21504098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3038.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21504098 is about 4637.2511253975. The cubic root of 21504098 is about 278.0825540241.

The spelling of 21504098 in words is "twenty-one million, five hundred four thousand, ninety-eight".