21340250 has 16 divisors (see below), whose sum is σ = 39949416. Its totient is φ = 8536000.

The previous prime is 21340247. The next prime is 21340273. The reversal of 21340250 is 5204312.

It can be written as a sum of positive squares in 4 ways, for example, as 8602489 + 12737761 = 2933^2 + 3569^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42431 + ... + 42930.

Almost surely, 2^21340250 is an apocalyptic number.

21340250 is a deficient number, since it is larger than the sum of its proper divisors (18609166).

21340250 is an equidigital number, since it uses as much as digits as its factorization.

21340250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85378 (or 85368 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 21340250 is about 4619.5508439674. The cubic root of 21340250 is about 277.3744799316.

Adding to 21340250 its reverse (5204312), we get a palindrome (26544562).

The spelling of 21340250 in words is "twenty-one million, three hundred forty thousand, two hundred fifty".