21148798 has 16 divisors (see below), whose sum is σ = 34700400. Its totient is φ = 9587200.

The previous prime is 21148783. The next prime is 21148807. The reversal of 21148798 is 89784112.

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 21148798.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8808 + ... + 10948.

It is an arithmetic number, because the mean of its divisors is an integer number (2168775).

It is a vampire number, since it can be written as 2141 ⋅ 9878 (with its own digits).

Almost surely, 2^21148798 is an apocalyptic number.

21148798 is a deficient number, since it is larger than the sum of its proper divisors (13551602).

21148798 is a wasteful number, since it uses less digits than its factorization.

21148798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2603.

The product of its digits is 32256, while the sum is 40.

The square root of 21148798 is about 4598.7822301127. The cubic root of 21148798 is about 276.5425074741.

The spelling of 21148798 in words is "twenty-one million, one hundred forty-eight thousand, seven hundred ninety-eight".