21603844244 has 12 divisors (see below), whose sum is σ = 37807797300. Its totient is φ = 10801616448.

The previous prime is 21603844243. The next prime is 21603844253. The reversal of 21603844244 is 44244830612.

It can be written as a sum of positive squares in 2 ways, for example, as 10909802500 + 10694041744 = 104450^2 + 103412^2 .

It is a super-2 number, since 2×21603844244² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21603844198 and 21603844207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603844243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173192 + ... + 270560.

It is an arithmetic number, because the mean of its divisors is an integer number (3150649775).

Almost surely, 2^21603844244 is an apocalyptic number.

It is an amenable number.

21603844244 is a deficient number, since it is larger than the sum of its proper divisors (16203953056).

21603844244 is a wasteful number, since it uses less digits than its factorization.

21603844244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152842 (or 152840 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 38.

The spelling of 21603844244 in words is "twenty-one billion, six hundred three million, eight hundred forty-four thousand, two hundred forty-four".