21044200540 has 48 divisors (see below), whose sum is σ = 48652702560. Its totient is φ = 7582222080.

The previous prime is 21044200493. The next prime is 21044200607. The reversal of 21044200540 is 4500244012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414807 + ... + 462766.

It is an arithmetic number, because the mean of its divisors is an integer number (1013597970).

Almost surely, 2^21044200540 is an apocalyptic number.

21044200540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21044200540 is an abundant number, since it is smaller than the sum of its proper divisors (27608502020).

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

21044200540 is a wasteful number, since it uses less digits than its factorization.

21044200540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877702 (or 877700 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 22.

Adding to 21044200540 its reverse (4500244012), we get a palindrome (25544444552).

The spelling of 21044200540 in words is "twenty-one billion, forty-four million, two hundred thousand, five hundred forty".