21242350 has 48 divisors (see below), whose sum is σ = 42573168. Its totient is φ = 7856640.

The previous prime is 21242339. The next prime is 21242357. The reversal of 21242350 is 5324212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242357) 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 23 ways as a sum of consecutive naturals, for example, 56764 + ... + 57136.

It is an arithmetic number, because the mean of its divisors is an integer number (886941).

Almost surely, 2^21242350 is an apocalyptic number.

21242350 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21242350 is a wasteful number, since it uses less digits than its factorization.

21242350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 469 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21242350 is about 4608.9423949535. The cubic root of 21242350 is about 276.9496708988.

Adding to 21242350 its reverse (5324212), we get a palindrome (26566562).

The spelling of 21242350 in words is "twenty-one million, two hundred forty-two thousand, three hundred fifty".