21114745 has 4 divisors (see below), whose sum is σ = 25337700. Its totient is φ = 16891792.

The previous prime is 21114727. The next prime is 21114749. The reversal of 21114745 is 54741112.

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 15657849 + 5456896 = 3957^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114745 - 2¹⁹ = 20590457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21114749) 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, 2111470 + ... + 2111479.

It is an arithmetic number, because the mean of its divisors is an integer number (6334425).

Almost surely, 2^21114745 is an apocalyptic number.

It is an amenable number.

21114745 is a deficient number, since it is larger than the sum of its proper divisors (4222955).

21114745 is an equidigital number, since it uses as much as digits as its factorization.

21114745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4222954.

The product of its digits is 1120, while the sum is 25.

The square root of 21114745 is about 4595.0783453604. The cubic root of 21114745 is about 276.3940016207.

Adding to 21114745 its reverse (54741112), we get a palindrome (75855857).

The spelling of 21114745 in words is "twenty-one million, one hundred fourteen thousand, seven hundred forty-five".