21480246 has 24 divisors (see below), whose sum is σ = 46628400. Its totient is φ = 7146576.

The previous prime is 21480233. The next prime is 21480247. The reversal of 21480246 is 64208412.

It is a super-2 number, since 2×21480246² = 922801936441032, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21480247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14655 + ... + 16053.

It is an arithmetic number, because the mean of its divisors is an integer number (1942850).

Almost surely, 2^21480246 is an apocalyptic number.

21480246 is an abundant number, since it is smaller than the sum of its proper divisors (25148154).

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

21480246 is a wasteful number, since it uses less digits than its factorization.

21480246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260 (or 2257 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21480246 is about 4634.6786296355. The cubic root of 21480246 is about 277.9797010867.

Adding to 21480246 its reverse (64208412), we get a palindrome (85688658).

The spelling of 21480246 in words is "twenty-one million, four hundred eighty thousand, two hundred forty-six".