21488044 has 6 divisors (see below), whose sum is σ = 37604084. Its totient is φ = 10744020.

The previous prime is 21488023. The next prime is 21488063. The reversal of 21488044 is 44088412.

It is a junction number, because it is equal to n+sod(n) for n = 21487997 and 21488015.

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 as a sum of consecutive naturals, namely, 2686002 + ... + 2686009.

Almost surely, 2^21488044 is an apocalyptic number.

It is an amenable number.

21488044 is a deficient number, since it is larger than the sum of its proper divisors (16116040).

21488044 is a wasteful number, since it uses less digits than its factorization.

21488044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5372015 (or 5372013 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 21488044 is about 4635.5198198260. The cubic root of 21488044 is about 278.0133354540.

The spelling of 21488044 in words is "twenty-one million, four hundred eighty-eight thousand, forty-four".