21098312 has 32 divisors (see below), whose sum is σ = 41212800. Its totient is φ = 10113600.

The previous prime is 21098269. The next prime is 21098327. The reversal of 21098312 is 21389012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48737 + ... + 49167.

It is an arithmetic number, because the mean of its divisors is an integer number (1287900).

Almost surely, 2^21098312 is an apocalyptic number.

It is an amenable number.

21098312 is a deficient number, since it is larger than the sum of its proper divisors (20114488).

21098312 is a wasteful number, since it uses less digits than its factorization.

21098312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 21098312 is about 4593.2898885222. The cubic root of 21098312 is about 276.3222798383.

The spelling of 21098312 in words is "twenty-one million, ninety-eight thousand, three hundred twelve".