21629044 has 6 divisors (see below), whose sum is σ = 37850834. Its totient is φ = 10814520.

The previous prime is 21629029. The next prime is 21629051. The reversal of 21629044 is 44092612.

It can be written as a sum of positive squares in only one way, i.e., 20160100 + 1468944 = 4490^2 + 1212^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2703627 + ... + 2703634.

Almost surely, 2^21629044 is an apocalyptic number.

It is an amenable number.

21629044 is a deficient number, since it is larger than the sum of its proper divisors (16221790).

21629044 is a wasteful number, since it uses less digits than its factorization.

21629044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5407265 (or 5407263 counting only the distinct ones).

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

The square root of 21629044 is about 4650.7036026821. The cubic root of 21629044 is about 278.6200984685.

The spelling of 21629044 in words is "twenty-one million, six hundred twenty-nine thousand, forty-four".