21347141 has 4 divisors (see below), whose sum is σ = 21367500. Its totient is φ = 21326784.

The previous prime is 21347111. The next prime is 21347147. The reversal of 21347141 is 14174312.

It is a happy number.

21347141 is nontrivially palindromic in base 2.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7134241 + 14212900 = 2671^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 21347141 - 2⁶ = 21347077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21347147) 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 3 ways as a sum of consecutive naturals, for example, 8516 + ... + 10733.

It is an arithmetic number, because the mean of its divisors is an integer number (5341875).

Almost surely, 2^21347141 is an apocalyptic number.

It is an amenable number.

21347141 is a deficient number, since it is larger than the sum of its proper divisors (20359).

21347141 is a wasteful number, since it uses less digits than its factorization.

21347141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20358.

The product of its digits is 672, while the sum is 23.

The square root of 21347141 is about 4620.2966354986. The cubic root of 21347141 is about 277.4043324691.

The spelling of 21347141 in words is "twenty-one million, three hundred forty-seven thousand, one hundred forty-one".