21368450 has 12 divisors (see below), whose sum is σ = 39745410. Its totient is φ = 8547360.

The previous prime is 21368429. The next prime is 21368453. The reversal of 21368450 is 5486312.

It can be written as a sum of positive squares in 3 ways, for example, as 8886361 + 12482089 = 2981^2 + 3533^2 .

It is a super-2 number, since 2×21368450² = 913221310805000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21368453) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213635 + ... + 213734.

Almost surely, 2^21368450 is an apocalyptic number.

21368450 is a deficient number, since it is larger than the sum of its proper divisors (18376960).

21368450 is a wasteful number, since it uses less digits than its factorization.

21368450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427381 (or 427376 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21368450 is about 4622.6020810794. The cubic root of 21368450 is about 277.4966046713.

The spelling of 21368450 in words is "twenty-one million, three hundred sixty-eight thousand, four hundred fifty".