21433117 has 8 divisors (see below), whose sum is σ = 22226040. Its totient is φ = 20643840.

The previous prime is 21433103. The next prime is 21433123. The reversal of 21433117 is 71133412.

It can be written as a sum of positive squares in 4 ways, for example, as 10896601 + 10536516 = 3301^2 + 3246^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21433117 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 (21433127) 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, 18013 + ... + 19165.

It is an arithmetic number, because the mean of its divisors is an integer number (2778255).

Almost surely, 2^21433117 is an apocalyptic number.

It is an amenable number.

21433117 is a deficient number, since it is larger than the sum of its proper divisors (792923).

21433117 is a wasteful number, since it uses less digits than its factorization.

21433117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1823.

The product of its digits is 504, while the sum is 22.

The square root of 21433117 is about 4629.5914506574. The cubic root of 21433117 is about 277.7762506168.

Adding to 21433117 its reverse (71133412), we get a palindrome (92566529).

The spelling of 21433117 in words is "twenty-one million, four hundred thirty-three thousand, one hundred seventeen".