21193347 has 8 divisors (see below), whose sum is σ = 32294656. Its totient is φ = 12110472.

The previous prime is 21193343. The next prime is 21193357. The reversal of 21193347 is 74339112.

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

It is not a de Polignac number, because 21193347 - 2² = 21193343 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21193343) 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, 504583 + ... + 504624.

It is an arithmetic number, because the mean of its divisors is an integer number (4036832).

Almost surely, 2^21193347 is an apocalyptic number.

21193347 is a deficient number, since it is larger than the sum of its proper divisors (11101309).

21193347 is a wasteful number, since it uses less digits than its factorization.

21193347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009217.

The product of its digits is 4536, while the sum is 30.

The square root of 21193347 is about 4603.6232469654. The cubic root of 21193347 is about 276.7365461137.

The spelling of 21193347 in words is "twenty-one million, one hundred ninety-three thousand, three hundred forty-seven".