21011488 has 12 divisors (see below), whose sum is σ = 41366430. Its totient is φ = 10505728.

The previous prime is 21011453. The next prime is 21011503. The reversal of 21011488 is 88411012.

It can be written as a sum of positive squares in only one way, i.e., 20684304 + 327184 = 4548^2 + 572^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328273 + ... + 328336.

Almost surely, 2^21011488 is an apocalyptic number.

It is an amenable number.

21011488 is a deficient number, since it is larger than the sum of its proper divisors (20354942).

21011488 is an equidigital number, since it uses as much as digits as its factorization.

21011488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656619 (or 656611 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 21011488 is about 4583.8289671409. The cubic root of 21011488 is about 275.9427172305.

The spelling of 21011488 in words is "twenty-one million, eleven thousand, four hundred eighty-eight".