21514246 has 16 divisors (see below), whose sum is σ = 36265824. Its totient is φ = 9497664.

The previous prime is 21514211. The next prime is 21514247. The reversal of 21514246 is 64241512.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21514246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17391 + ... + 18586.

It is an arithmetic number, because the mean of its divisors is an integer number (2266614).

Almost surely, 2^21514246 is an apocalyptic number.

21514246 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21514246 is a deficient number, since it is larger than the sum of its proper divisors (14751578).

21514246 is a wasteful number, since it uses less digits than its factorization.

21514246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36015.

The product of its digits is 1920, while the sum is 25.

The square root of 21514246 is about 4638.3451790482. The cubic root of 21514246 is about 278.1262904624.

Adding to 21514246 its reverse (64241512), we get a palindrome (85755758).

The spelling of 21514246 in words is "twenty-one million, five hundred fourteen thousand, two hundred forty-six".