21352475 has 6 divisors (see below), whose sum is σ = 26477100. Its totient is φ = 17081960.

The previous prime is 21352451. The next prime is 21352477. The reversal of 21352475 is 57425312.

It is a happy number.

It is not a de Polignac number, because 21352475 - 2¹⁶ = 21286939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21352477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 427025 + ... + 427074.

It is an arithmetic number, because the mean of its divisors is an integer number (4412850).

Almost surely, 2^21352475 is an apocalyptic number.

21352475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21352475 is a deficient number, since it is larger than the sum of its proper divisors (5124625).

21352475 is an equidigital number, since it uses as much as digits as its factorization.

21352475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854109 (or 854104 counting only the distinct ones).

The product of its digits is 8400, while the sum is 29.

The square root of 21352475 is about 4620.8738351095. The cubic root of 21352475 is about 277.4274355080.

Adding to 21352475 its reverse (57425312), we get a palindrome (78777787).

The spelling of 21352475 in words is "twenty-one million, three hundred fifty-two thousand, four hundred seventy-five".