21146513 has 4 divisors (see below), whose sum is σ = 21161280. Its totient is φ = 21131748.

The previous prime is 21146507. The next prime is 21146519. The reversal of 21146513 is 31564112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (21146507) and next prime (21146519).

It is a cyclic number.

It is not a de Polignac number, because 21146513 - 2¹⁰ = 21145489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21146519) 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 3 ways as a sum of consecutive naturals, for example, 4973 + ... + 8186.

It is an arithmetic number, because the mean of its divisors is an integer number (5290320).

Almost surely, 2^21146513 is an apocalyptic number.

It is an amenable number.

21146513 is a deficient number, since it is larger than the sum of its proper divisors (14767).

21146513 is a wasteful number, since it uses less digits than its factorization.

21146513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14766.

The product of its digits is 720, while the sum is 23.

The square root of 21146513 is about 4598.5337880677. The cubic root of 21146513 is about 276.5325475324.

The spelling of 21146513 in words is "twenty-one million, one hundred forty-six thousand, five hundred thirteen".