21142383 has 8 divisors (see below), whose sum is σ = 29673600. Its totient is φ = 13353048.

The previous prime is 21142379. The next prime is 21142393. The reversal of 21142383 is 38324112.

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

It is not a de Polignac number, because 21142383 - 2² = 21142379 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142343) 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, 185403 + ... + 185516.

It is an arithmetic number, because the mean of its divisors is an integer number (3709200).

Almost surely, 2^21142383 is an apocalyptic number.

21142383 is a deficient number, since it is larger than the sum of its proper divisors (8531217).

21142383 is a wasteful number, since it uses less digits than its factorization.

21142383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370941.

The product of its digits is 1152, while the sum is 24.

The square root of 21142383 is about 4598.0847099635. The cubic root of 21142383 is about 276.5145437165.

Adding to 21142383 its reverse (38324112), we get a palindrome (59466495).

The spelling of 21142383 in words is "twenty-one million, one hundred forty-two thousand, three hundred eighty-three".