21353143 has 8 divisors (see below), whose sum is σ = 24435488. Its totient is φ = 18278784.

The previous prime is 21353119. The next prime is 21353153. The reversal of 21353143 is 34135312.

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 21353143 - 2¹³ = 21344951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21353153) 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, 5755 + ... + 8707.

It is an arithmetic number, because the mean of its divisors is an integer number (3054436).

Almost surely, 2^21353143 is an apocalyptic number.

21353143 is a deficient number, since it is larger than the sum of its proper divisors (3082345).

21353143 is a wasteful number, since it uses less digits than its factorization.

21353143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3993.

The product of its digits is 1080, while the sum is 22.

The square root of 21353143 is about 4620.9461152452. The cubic root of 21353143 is about 277.4303285309.

Adding to 21353143 its reverse (34135312), we get a palindrome (55488455).

The spelling of 21353143 in words is "twenty-one million, three hundred fifty-three thousand, one hundred forty-three".