21219488 has 24 divisors (see below), whose sum is σ = 42028308. Its totient is φ = 10545664.

The previous prime is 21219481. The next prime is 21219493. The reversal of 21219488 is 88491212.

It can be written as a sum of positive squares in 2 ways, for example, as 21049744 + 169744 = 4588^2 + 412^2 .

It is not an unprimeable number, because it can be changed into a prime (21219481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3620 + ... + 7452.

Almost surely, 2^21219488 is an apocalyptic number.

It is an amenable number.

21219488 is a deficient number, since it is larger than the sum of its proper divisors (20808820).

21219488 is a wasteful number, since it uses less digits than its factorization.

21219488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016 (or 4008 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 21219488 is about 4606.4615487378. The cubic root of 21219488 is about 276.8502798836.

The spelling of 21219488 in words is "twenty-one million, two hundred nineteen thousand, four hundred eighty-eight".