21342250 has 16 divisors (see below), whose sum is σ = 39953160. Its totient is φ = 8536800.

The previous prime is 21342241. The next prime is 21342257. The reversal of 21342250 is 5224312.

It can be written as a sum of positive squares in 4 ways, for example, as 938961 + 20403289 = 969^2 + 4517^2 .

It is not an unprimeable number, because it can be changed into a prime (21342257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42435 + ... + 42934.

Almost surely, 2^21342250 is an apocalyptic number.

21342250 is a deficient number, since it is larger than the sum of its proper divisors (18610910).

21342250 is an equidigital number, since it uses as much as digits as its factorization.

21342250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85386 (or 85376 counting only the distinct ones).

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

The square root of 21342250 is about 4619.7673101575. The cubic root of 21342250 is about 277.3831448040.

Adding to 21342250 its reverse (5224312), we get a palindrome (26566562).

The spelling of 21342250 in words is "twenty-one million, three hundred forty-two thousand, two hundred fifty".