21106143 has 16 divisors (see below), whose sum is σ = 31356000. Its totient is φ = 14031360.

The previous prime is 21106121. The next prime is 21106147. The reversal of 21106143 is 34160112.

It is a happy number.

It is not a de Polignac number, because 21106143 - 2⁶ = 21106079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21106147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11253 + ... + 12993.

It is an arithmetic number, because the mean of its divisors is an integer number (1959750).

Almost surely, 2^21106143 is an apocalyptic number.

21106143 is a deficient number, since it is larger than the sum of its proper divisors (10249857).

21106143 is a wasteful number, since it uses less digits than its factorization.

21106143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 21106143 is about 4594.1422485596. The cubic root of 21106143 is about 276.3564628590.

Adding to 21106143 its reverse (34160112), we get a palindrome (55266255).

The spelling of 21106143 in words is "twenty-one million, one hundred six thousand, one hundred forty-three".