21127342 has 4 divisors (see below), whose sum is σ = 31691016. Its totient is φ = 10563670.

The previous prime is 21127331. The next prime is 21127343. The reversal of 21127342 is 24372112.

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 (21127343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5281834 + ... + 5281837.

It is an arithmetic number, because the mean of its divisors is an integer number (7922754).

Almost surely, 2^21127342 is an apocalyptic number.

21127342 is a deficient number, since it is larger than the sum of its proper divisors (10563674).

21127342 is a wasteful number, since it uses less digits than its factorization.

21127342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10563673.

The product of its digits is 672, while the sum is 22.

The square root of 21127342 is about 4596.4488466641. The cubic root of 21127342 is about 276.4489559992.

Adding to 21127342 its reverse (24372112), we get a palindrome (45499454).

The spelling of 21127342 in words is "twenty-one million, one hundred twenty-seven thousand, three hundred forty-two".