21201035244 has 24 divisors (see below), whose sum is σ = 49645136688. Its totient is φ = 7041861120.

The previous prime is 21201035137. The next prime is 21201035287. The reversal of 21201035244 is 44253010212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140317 + ... + 3147060.

It is an arithmetic number, because the mean of its divisors is an integer number (2068547362).

Almost surely, 2^21201035244 is an apocalyptic number.

It is an amenable number.

21201035244 is an abundant number, since it is smaller than the sum of its proper divisors (28444101444).

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

21201035244 is a wasteful number, since it uses less digits than its factorization.

21201035244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6287665 (or 6287663 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

Adding to 21201035244 its reverse (44253010212), we get a palindrome (65454045456).

The spelling of 21201035244 in words is "twenty-one billion, two hundred one million, thirty-five thousand, two hundred forty-four".