21098116 has 24 divisors (see below), whose sum is σ = 39886784. Its totient is φ = 9707040.

The previous prime is 21098111. The next prime is 21098141. The reversal of 21098116 is 61189012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21098111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32491 + ... + 33133.

Almost surely, 2^21098116 is an apocalyptic number.

21098116 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21098116 is a deficient number, since it is larger than the sum of its proper divisors (18788668).

21098116 is a wasteful number, since it uses less digits than its factorization.

21098116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291 (or 1289 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 21098116 is about 4593.2685530023. The cubic root of 21098116 is about 276.3214241722.

The spelling of 21098116 in words is "twenty-one million, ninety-eight thousand, one hundred sixteen".