21192357 has 8 divisors (see below), whose sum is σ = 28460320. Its totient is φ = 14026320.

The previous prime is 21192349. The next prime is 21192371. The reversal of 21192357 is 75329112.

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

It is not a de Polignac number, because 21192357 - 2³ = 21192349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21192337) 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, 24994 + ... + 25827.

It is an arithmetic number, because the mean of its divisors is an integer number (3557540).

Almost surely, 2^21192357 is an apocalyptic number.

It is an amenable number.

21192357 is a deficient number, since it is larger than the sum of its proper divisors (7267963).

21192357 is a wasteful number, since it uses less digits than its factorization.

21192357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50963.

The product of its digits is 3780, while the sum is 30.

The square root of 21192357 is about 4603.5157217066. The cubic root of 21192357 is about 276.7322370028.

The spelling of 21192357 in words is "twenty-one million, one hundred ninety-two thousand, three hundred fifty-seven".