21098310 has 16 divisors (see below), whose sum is σ = 50636016. Its totient is φ = 5626208.

The previous prime is 21098269. The next prime is 21098327. The reversal of 21098310 is 1389012.

It is a super-2 number, since 2×21098310² = 890277369712200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351609 + ... + 351668.

It is an arithmetic number, because the mean of its divisors is an integer number (3164751).

Almost surely, 2^21098310 is an apocalyptic number.

21098310 is an abundant number, since it is smaller than the sum of its proper divisors (29537706).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21098310 is a wasteful number, since it uses less digits than its factorization.

21098310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703287.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 21098310 is about 4593.2896708133. The cubic root of 21098310 is about 276.3222711071.

The spelling of 21098310 in words is "twenty-one million, ninety-eight thousand, three hundred ten".