21035044 has 6 divisors (see below), whose sum is σ = 36811334. Its totient is φ = 10517520.

The previous prime is 21035029. The next prime is 21035059. The reversal of 21035044 is 44053012.

It is an interprime number because it is at equal distance from previous prime (21035029) and next prime (21035059).

It can be written as a sum of positive squares in only one way, i.e., 18748900 + 2286144 = 4330^2 + 1512^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629377 + ... + 2629384.

Almost surely, 2^21035044 is an apocalyptic number.

It is an amenable number.

21035044 is a deficient number, since it is larger than the sum of its proper divisors (15776290).

21035044 is a wasteful number, since it uses less digits than its factorization.

21035044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5258765 (or 5258763 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21035044 is about 4586.3977149829. The cubic root of 21035044 is about 276.0457986031.

Adding to 21035044 its reverse (44053012), we get a palindrome (65088056).

The spelling of 21035044 in words is "twenty-one million, thirty-five thousand, forty-four".