21741142 has 4 divisors (see below), whose sum is σ = 32611716. Its totient is φ = 10870570.

The previous prime is 21741127. The next prime is 21741143. The reversal of 21741142 is 24114712.

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 (21741143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5435284 + ... + 5435287.

It is an arithmetic number, because the mean of its divisors is an integer number (8152929).

Almost surely, 2^21741142 is an apocalyptic number.

21741142 is a deficient number, since it is larger than the sum of its proper divisors (10870574).

21741142 is a wasteful number, since it uses less digits than its factorization.

21741142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10870573.

The product of its digits is 448, while the sum is 22.

The square root of 21741142 is about 4662.7397525489. The cubic root of 21741142 is about 279.1006090480.

Adding to 21741142 its reverse (24114712), we get a palindrome (45855854).

The spelling of 21741142 in words is "twenty-one million, seven hundred forty-one thousand, one hundred forty-two".