21142433 has 8 divisors (see below), whose sum is σ = 23253888. Its totient is φ = 19100304.

The previous prime is 21142427. The next prime is 21142439. The reversal of 21142433 is 33424112.

It is an interprime number because it is at equal distance from previous prime (21142427) and next prime (21142439).

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 21142433 - 2¹⁸ = 20880289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16691 + ... + 17912.

It is an arithmetic number, because the mean of its divisors is an integer number (2906736).

Almost surely, 2^21142433 is an apocalyptic number.

It is an amenable number.

21142433 is a deficient number, since it is larger than the sum of its proper divisors (2111455).

21142433 is a wasteful number, since it uses less digits than its factorization.

21142433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34663.

The product of its digits is 576, while the sum is 20.

The square root of 21142433 is about 4598.0901470067. The cubic root of 21142433 is about 276.5147616944.

Adding to 21142433 its reverse (33424112), we get a palindrome (54566545).

The spelling of 21142433 in words is "twenty-one million, one hundred forty-two thousand, four hundred thirty-three".