21301242 has 32 divisors (see below), whose sum is σ = 45619200. Its totient is φ = 6610608.

The previous prime is 21301229. The next prime is 21301253. The reversal of 21301242 is 24210312.

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, 5143 + ... + 8309.

It is an arithmetic number, because the mean of its divisors is an integer number (1425600).

Almost surely, 2^21301242 is an apocalyptic number.

21301242 is an abundant number, since it is smaller than the sum of its proper divisors (24317958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21301242 is a wasteful number, since it uses less digits than its factorization.

21301242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3250.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21301242 is about 4615.3268573309. The cubic root of 21301242 is about 277.2053719008.

Adding to 21301242 its reverse (24210312), we get a palindrome (45511554).

The spelling of 21301242 in words is "twenty-one million, three hundred one thousand, two hundred forty-two".