21003011044 has 6 divisors (see below), whose sum is σ = 36755269334. Its totient is φ = 10501505520.

The previous prime is 21003010999. The next prime is 21003011111. The reversal of 21003011044 is 44011030012.

It can be written as a sum of positive squares in only one way, i.e., 14256360000 + 6746651044 = 119400^2 + 82138^2 .

It is a super-3 number, since 3×21003011044³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625376377 + ... + 2625376384.

Almost surely, 2^21003011044 is an apocalyptic number.

It is an amenable number.

21003011044 is a deficient number, since it is larger than the sum of its proper divisors (15752258290).

21003011044 is a wasteful number, since it uses less digits than its factorization.

21003011044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5250752765 (or 5250752763 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21003011044 its reverse (44011030012), we get a palindrome (65014041056).

The spelling of 21003011044 in words is "twenty-one billion, three million, eleven thousand, forty-four".