21352373 has 8 divisors (see below), whose sum is σ = 24540480. Its totient is φ = 18198720.

The previous prime is 21352369. The next prime is 21352393. The reversal of 21352373 is 37325312.

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 21352373 - 2² = 21352369 is a prime.

It is a super-2 number, since 2×21352373² = 911847665462258, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352343) 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, 7268 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (3067560).

Almost surely, 2^21352373 is an apocalyptic number.

It is an amenable number.

21352373 is a deficient number, since it is larger than the sum of its proper divisors (3188107).

21352373 is a wasteful number, since it uses less digits than its factorization.

21352373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17227.

The product of its digits is 3780, while the sum is 26.

The square root of 21352373 is about 4620.8627982229. The cubic root of 21352373 is about 277.4269937537.

Adding to 21352373 its reverse (37325312), we get a palindrome (58677685).

The spelling of 21352373 in words is "twenty-one million, three hundred fifty-two thousand, three hundred seventy-three".