21114145 has 16 divisors (see below), whose sum is σ = 27473040. Its totient is φ = 15485184.

The previous prime is 21114143. The next prime is 21114157. The reversal of 21114145 is 54141112.

It can be written as a sum of positive squares in 8 ways, for example, as 5997601 + 15116544 = 2449^2 + 3888^2 .

It is not a de Polignac number, because 21114145 - 2¹ = 21114143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21114143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9171 + ... + 11239.

It is an arithmetic number, because the mean of its divisors is an integer number (1717065).

Almost surely, 2^21114145 is an apocalyptic number.

It is an amenable number.

21114145 is a deficient number, since it is larger than the sum of its proper divisors (6358895).

21114145 is a wasteful number, since it uses less digits than its factorization.

21114145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2244.

The product of its digits is 160, while the sum is 19.

The square root of 21114145 is about 4595.0130576528. The cubic root of 21114145 is about 276.3913835770.

Adding to 21114145 its reverse (54141112), we get a palindrome (75255257).

The spelling of 21114145 in words is "twenty-one million, one hundred fourteen thousand, one hundred forty-five".