21133143 has 20 divisors (see below), whose sum is σ = 31813320. Its totient is φ = 13979952.

The previous prime is 21133121. The next prime is 21133153. The reversal of 21133143 is 34133112.

It is not a de Polignac number, because 21133143 - 2¹⁰ = 21132119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133153) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 10321 + ... + 12197.

It is an arithmetic number, because the mean of its divisors is an integer number (1590666).

Almost surely, 2^21133143 is an apocalyptic number.

21133143 is a deficient number, since it is larger than the sum of its proper divisors (10680177).

21133143 is a wasteful number, since it uses less digits than its factorization.

21133143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2028 (or 2019 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 21133143 is about 4597.0798339816. The cubic root of 21133143 is about 276.4742555004.

Adding to 21133143 its reverse (34133112), we get a palindrome (55266255).

The spelling of 21133143 in words is "twenty-one million, one hundred thirty-three thousand, one hundred forty-three".