21220093 has 8 divisors (see below), whose sum is σ = 22435200. Its totient is φ = 20014848.

The previous prime is 21220019. The next prime is 21220103. The reversal of 21220093 is 39002212.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21220093 - 2⁹ = 21219581 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 21220093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2205 + ... + 6877.

It is an arithmetic number, because the mean of its divisors is an integer number (2804400).

Almost surely, 2^21220093 is an apocalyptic number.

It is an amenable number.

21220093 is a deficient number, since it is larger than the sum of its proper divisors (1215107).

21220093 is a wasteful number, since it uses less digits than its factorization.

21220093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4931.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21220093 is about 4606.5272168956. The cubic root of 21220093 is about 276.8529110000.

The spelling of 21220093 in words is "twenty-one million, two hundred twenty thousand, ninety-three".