21102093 has 8 divisors (see below), whose sum is σ = 31262400. Its totient is φ = 14068044.

The previous prime is 21102091. The next prime is 21102101. The reversal of 21102093 is 39020112.

It is a happy number.

It is not a de Polignac number, because 21102093 - 2¹ = 21102091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102091) by changing a digit.

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, 390753 + ... + 390806.

It is an arithmetic number, because the mean of its divisors is an integer number (3907800).

Almost surely, 2^21102093 is an apocalyptic number.

It is an amenable number.

21102093 is a deficient number, since it is larger than the sum of its proper divisors (10160307).

21102093 is an equidigital number, since it uses as much as digits as its factorization.

21102093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781568 (or 781562 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 21102093 is about 4593.7014487230. The cubic root of 21102093 is about 276.3387852999.

The spelling of 21102093 in words is "twenty-one million, one hundred two thousand, ninety-three".