21450246 has 16 divisors (see below), whose sum is σ = 43383600. Its totient is φ = 7069568.

The previous prime is 21450241. The next prime is 21450293. The reversal of 21450246 is 64205412.

It is a super-2 number, since 2×21450246² = 920226106921032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450241) 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 7 ways as a sum of consecutive naturals, for example, 19551 + ... + 20618.

It is an arithmetic number, because the mean of its divisors is an integer number (2711475).

Almost surely, 2^21450246 is an apocalyptic number.

21450246 is an abundant number, since it is smaller than the sum of its proper divisors (21933354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21450246 is a wasteful number, since it uses less digits than its factorization.

21450246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40263.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21450246 is about 4631.4410284489. The cubic root of 21450246 is about 277.8502290065.

Adding to 21450246 its reverse (64205412), we get a palindrome (85655658).

The spelling of 21450246 in words is "twenty-one million, four hundred fifty thousand, two hundred forty-six".