21148835 has 4 divisors (see below), whose sum is σ = 25378608. Its totient is φ = 16919064.

The previous prime is 21148823. The next prime is 21148847. The reversal of 21148835 is 53884112.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21148823) and next prime (21148847).

It is a cyclic number.

It is not a de Polignac number, because 21148835 - 2¹⁰ = 21147811 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 2114879 + ... + 2114888.

It is an arithmetic number, because the mean of its divisors is an integer number (6344652).

Almost surely, 2^21148835 is an apocalyptic number.

21148835 is a deficient number, since it is larger than the sum of its proper divisors (4229773).

21148835 is an equidigital number, since it uses as much as digits as its factorization.

21148835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4229772.

The product of its digits is 7680, while the sum is 32.

The square root of 21148835 is about 4598.7862529150. The cubic root of 21148835 is about 276.5426687452.

The spelling of 21148835 in words is "twenty-one million, one hundred forty-eight thousand, eight hundred thirty-five".