21026998 has 8 divisors (see below), whose sum is σ = 31835592. Its totient is φ = 10415136.

The previous prime is 21026987. The next prime is 21027007. The reversal of 21026998 is 89962012.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48915 + ... + 49342.

It is an arithmetic number, because the mean of its divisors is an integer number (3979449).

Almost surely, 2^21026998 is an apocalyptic number.

21026998 is a deficient number, since it is larger than the sum of its proper divisors (10808594).

21026998 is a wasteful number, since it uses less digits than its factorization.

21026998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98366.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 21026998 is about 4585.5204720947. The cubic root of 21026998 is about 276.0105978567.

The spelling of 21026998 in words is "twenty-one million, twenty-six thousand, nine hundred ninety-eight".