21097293 has 12 divisors (see below), whose sum is σ = 32722560. Its totient is φ = 12055512.

The previous prime is 21097291. The next prime is 21097331. The reversal of 21097293 is 39279012.

It is not a de Polignac number, because 21097293 - 2¹ = 21097291 is a prime.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21097291) 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 11 ways as a sum of consecutive naturals, for example, 71613 + ... + 71906.

It is an arithmetic number, because the mean of its divisors is an integer number (2726880).

Almost surely, 2^21097293 is an apocalyptic number.

It is an amenable number.

21097293 is a deficient number, since it is larger than the sum of its proper divisors (11625267).

21097293 is a wasteful number, since it uses less digits than its factorization.

21097293 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143536 (or 143529 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 21097293 is about 4593.1789645081. The cubic root of 21097293 is about 276.3178311896.

The spelling of 21097293 in words is "twenty-one million, ninety-seven thousand, two hundred ninety-three".