21362143 has 8 divisors (see below), whose sum is σ = 23337936. Its totient is φ = 19392000.

The previous prime is 21362119. The next prime is 21362161. The reversal of 21362143 is 34126312.

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 21362143 - 2¹³ = 21353951 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 (21362113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12543 + ... + 14143.

It is an arithmetic number, because the mean of its divisors is an integer number (2917242).

Almost surely, 2^21362143 is an apocalyptic number.

21362143 is a deficient number, since it is larger than the sum of its proper divisors (1975793).

21362143 is a wasteful number, since it uses less digits than its factorization.

21362143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2825.

The product of its digits is 864, while the sum is 22.

The square root of 21362143 is about 4621.9198392010. The cubic root of 21362143 is about 277.4693005024.

Adding to 21362143 its reverse (34126312), we get a palindrome (55488455).

The spelling of 21362143 in words is "twenty-one million, three hundred sixty-two thousand, one hundred forty-three".