21143417 has 8 divisors (see below), whose sum is σ = 22438080. Its totient is φ = 19880080.

The previous prime is 21143411. The next prime is 21143453. The reversal of 21143417 is 71434112.

It is a happy number.

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 21143417 - 2¹⁰ = 21142393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21143392 and 21143401.

It is not an unprimeable number, because it can be changed into a prime (21143411) 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, 6434 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (2804760).

Almost surely, 2^21143417 is an apocalyptic number.

It is an amenable number.

21143417 is a deficient number, since it is larger than the sum of its proper divisors (1294663).

21143417 is a wasteful number, since it uses less digits than its factorization.

21143417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15663.

The product of its digits is 672, while the sum is 23.

The square root of 21143417 is about 4598.1971467087. The cubic root of 21143417 is about 276.5190514294.

Adding to 21143417 its reverse (71434112), we get a palindrome (92577529).

The spelling of 21143417 in words is "twenty-one million, one hundred forty-three thousand, four hundred seventeen".