53421665 has 16 divisors (see below), whose sum is σ = 71084736. Its totient is φ = 38212800.

The previous prime is 53421653. The next prime is 53421677. The reversal of 53421665 is 56612435.

53421665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (53421653) and next prime (53421677).

It is not a de Polignac number, because 53421665 - 2¹⁸ = 53159521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 4607 + ... + 11316.

It is an arithmetic number, because the mean of its divisors is an integer number (4442796).

Almost surely, 2^53421665 is an apocalyptic number.

53421665 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

53421665 is a deficient number, since it is larger than the sum of its proper divisors (17663071).

53421665 is a wasteful number, since it uses less digits than its factorization.

53421665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16000.

The product of its digits is 21600, while the sum is 32.

The square root of 53421665 is about 7309.0125872104. The cubic root of 53421665 is about 376.6221051346.

It can be divided in two parts, 5342 and 1665, that added together give a palindrome (7007).

The spelling of 53421665 in words is "fifty-three million, four hundred twenty-one thousand, six hundred sixty-five".