21269373 has 8 divisors (see below), whose sum is σ = 28394688. Its totient is φ = 14161824.

The previous prime is 21269359. The next prime is 21269401. The reversal of 21269373 is 37396212.

It is a happy number.

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

It is not a de Polignac number, because 21269373 - 2⁴ = 21269357 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21265373) 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, 1336 + ... + 6657.

It is an arithmetic number, because the mean of its divisors is an integer number (3549336).

Almost surely, 2^21269373 is an apocalyptic number.

It is an amenable number.

21269373 is a deficient number, since it is larger than the sum of its proper divisors (7125315).

21269373 is an equidigital number, since it uses as much as digits as its factorization.

21269373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8883.

The product of its digits is 13608, while the sum is 33.

The square root of 21269373 is about 4611.8730468216. The cubic root of 21269373 is about 277.0670596632.

The spelling of 21269373 in words is "twenty-one million, two hundred sixty-nine thousand, three hundred seventy-three".