21148633 has 4 divisors (see below), whose sum is σ = 23071248. Its totient is φ = 19226020.

The previous prime is 21148601. The next prime is 21148667. The reversal of 21148633 is 33684112.

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 not a de Polignac number, because 21148633 - 2⁵ = 21148601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21148033) 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 3 ways as a sum of consecutive naturals, for example, 961291 + ... + 961312.

It is an arithmetic number, because the mean of its divisors is an integer number (5767812).

Almost surely, 2^21148633 is an apocalyptic number.

It is an amenable number.

21148633 is a deficient number, since it is larger than the sum of its proper divisors (1922615).

21148633 is a wasteful number, since it uses less digits than its factorization.

21148633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1922614.

The product of its digits is 3456, while the sum is 28.

The square root of 21148633 is about 4598.7642905459. The cubic root of 21148633 is about 276.5417882901.

The spelling of 21148633 in words is "twenty-one million, one hundred forty-eight thousand, six hundred thirty-three".