21464075 has 6 divisors (see below), whose sum is σ = 26615484. Its totient is φ = 17171240.

The previous prime is 21464057. The next prime is 21464077. The reversal of 21464075 is 57046412.

It is not a de Polignac number, because 21464075 - 2¹⁰ = 21463051 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21464077) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 429257 + ... + 429306.

It is an arithmetic number, because the mean of its divisors is an integer number (4435914).

Almost surely, 2^21464075 is an apocalyptic number.

21464075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21464075 is a deficient number, since it is larger than the sum of its proper divisors (5151409).

21464075 is an equidigital number, since it uses as much as digits as its factorization.

21464075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858573 (or 858568 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21464075 is about 4632.9337357661. The cubic root of 21464075 is about 277.9099263076.

It can be divided in two parts, 2146407 and 5, that added together give a palindrome (2146412).

The spelling of 21464075 in words is "twenty-one million, four hundred sixty-four thousand, seventy-five".