21032275 has 12 divisors (see below), whose sum is σ = 28451304. Its totient is φ = 15296000.

The previous prime is 21032273. The next prime is 21032287. The reversal of 21032275 is 57223012.

It is not a de Polignac number, because 21032275 - 2¹ = 21032273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37966 + ... + 38515.

It is an arithmetic number, because the mean of its divisors is an integer number (2370942).

Almost surely, 2^21032275 is an apocalyptic number.

21032275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21032275 is a deficient number, since it is larger than the sum of its proper divisors (7419029).

21032275 is a wasteful number, since it uses less digits than its factorization.

21032275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76502 (or 76497 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 21032275 is about 4586.0958341491. The cubic root of 21032275 is about 276.0336854146.

Adding to 21032275 its reverse (57223012), we get a palindrome (78255287).

The spelling of 21032275 in words is "twenty-one million, thirty-two thousand, two hundred seventy-five".