21343142 has 4 divisors (see below), whose sum is σ = 32014716. Its totient is φ = 10671570.

The previous prime is 21343141. The next prime is 21343151. The reversal of 21343142 is 24134312.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21343141) 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 as a sum of consecutive naturals, namely, 5335784 + ... + 5335787.

It is an arithmetic number, because the mean of its divisors is an integer number (8003679).

Almost surely, 2^21343142 is an apocalyptic number.

21343142 is a deficient number, since it is larger than the sum of its proper divisors (10671574).

21343142 is a wasteful number, since it uses less digits than its factorization.

21343142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10671573.

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

The square root of 21343142 is about 4619.8638508077. The cubic root of 21343142 is about 277.3870091626.

Adding to 21343142 its reverse (24134312), we get a palindrome (45477454).

The spelling of 21343142 in words is "twenty-one million, three hundred forty-three thousand, one hundred forty-two".