21414765 has 16 divisors (see below), whose sum is σ = 34327296. Its totient is φ = 11400000.

The previous prime is 21414763. The next prime is 21414779. The reversal of 21414765 is 56741412.

It is not a de Polignac number, because 21414765 - 2¹ = 21414763 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414761) 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 15 ways as a sum of consecutive naturals, for example, 10315 + ... + 12215.

It is an arithmetic number, because the mean of its divisors is an integer number (2145456).

Almost surely, 2^21414765 is an apocalyptic number.

It is an amenable number.

21414765 is a deficient number, since it is larger than the sum of its proper divisors (12912531).

21414765 is a wasteful number, since it uses less digits than its factorization.

21414765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660.

The product of its digits is 6720, while the sum is 30.

The square root of 21414765 is about 4627.6089938542. The cubic root of 21414765 is about 277.6969464661.

The spelling of 21414765 in words is "twenty-one million, four hundred fourteen thousand, seven hundred sixty-five".