21340450 has 24 divisors (see below), whose sum is σ = 40447188. Its totient is φ = 8374080.

The previous prime is 21340441. The next prime is 21340469. The reversal of 21340450 is 5404312.

It can be written as a sum of positive squares in 6 ways, for example, as 13155129 + 8185321 = 3627^2 + 2861^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1377 + ... + 6676.

Almost surely, 2^21340450 is an apocalyptic number.

21340450 is a deficient number, since it is larger than the sum of its proper divisors (19106738).

21340450 is a wasteful number, since it uses less digits than its factorization.

21340450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8118 (or 8113 counting only the distinct ones).

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

The square root of 21340450 is about 4619.5724910429. The cubic root of 21340450 is about 277.3753464432.

Adding to 21340450 its reverse (5404312), we get a palindrome (26744762).

The spelling of 21340450 in words is "twenty-one million, three hundred forty thousand, four hundred fifty".