21198662 has 8 divisors (see below), whose sum is σ = 31819392. Its totient is φ = 10592200.

The previous prime is 21198631. The next prime is 21198673. The reversal of 21198662 is 26689112.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 1712 + ... + 6732.

It is an arithmetic number, because the mean of its divisors is an integer number (3977424).

Almost surely, 2^21198662 is an apocalyptic number.

21198662 is a deficient number, since it is larger than the sum of its proper divisors (10620730).

21198662 is a wasteful number, since it uses less digits than its factorization.

21198662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7134.

The product of its digits is 10368, while the sum is 35.

The square root of 21198662 is about 4604.2004734807. The cubic root of 21198662 is about 276.7596780869.

The spelling of 21198662 in words is "twenty-one million, one hundred ninety-eight thousand, six hundred sixty-two".