21003413244 has 24 divisors (see below), whose sum is σ = 53463234048. Its totient is φ = 6364670640.

The previous prime is 21003413237. The next prime is 21003413261. The reversal of 21003413244 is 44231430012.

It is a super-2 number, since 2×21003413244² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79558252 + ... + 79558515.

It is an arithmetic number, because the mean of its divisors is an integer number (2227634752).

Almost surely, 2^21003413244 is an apocalyptic number.

It is an amenable number.

21003413244 is an abundant number, since it is smaller than the sum of its proper divisors (32459820804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21003413244 is a wasteful number, since it uses less digits than its factorization.

21003413244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159116785 (or 159116783 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21003413244 its reverse (44231430012), we get a palindrome (65234843256).

The spelling of 21003413244 in words is "twenty-one billion, three million, four hundred thirteen thousand, two hundred forty-four".