21146499 has 48 divisors (see below), whose sum is σ = 35852544. Its totient is φ = 11880000.

The previous prime is 21146399. The next prime is 21146501. The reversal of 21146499 is 99464112.

It is a happy number.

21146499 is a `hidden beast` number, since 2 + 1 + 1 + 4 + 649 + 9 = 666.

It is not a de Polignac number, because 21146499 - 2⁸ = 21146243 is a prime.

It is a super-3 number, since 3×21146499³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21146299) 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 47 ways as a sum of consecutive naturals, for example, 84124 + ... + 84374.

It is an arithmetic number, because the mean of its divisors is an integer number (746928).

Almost surely, 2^21146499 is an apocalyptic number.

21146499 is a deficient number, since it is larger than the sum of its proper divisors (14706045).

21146499 is a wasteful number, since it uses less digits than its factorization.

21146499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328 (or 325 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21146499 is about 4598.5322658431. The cubic root of 21146499 is about 276.5324865064.

The spelling of 21146499 in words is "twenty-one million, one hundred forty-six thousand, four hundred ninety-nine".