21032242 has 16 divisors (see below), whose sum is σ = 39333312. Its totient is φ = 8194320.

The previous prime is 21032237. The next prime is 21032267. The reversal of 21032242 is 24223012.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 68133 + ... + 68440.

It is an arithmetic number, because the mean of its divisors is an integer number (2458332).

Almost surely, 2^21032242 is an apocalyptic number.

21032242 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21032242 is a deficient number, since it is larger than the sum of its proper divisors (18301070).

21032242 is a wasteful number, since it uses less digits than its factorization.

21032242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136593.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21032242 is about 4586.0922363162. The cubic root of 21032242 is about 276.0335410473.

Adding to 21032242 its reverse (24223012), we get a palindrome (45255254).

The spelling of 21032242 in words is "twenty-one million, thirty-two thousand, two hundred forty-two".