21002230540 has 12 divisors (see below), whose sum is σ = 44104684176. Its totient is φ = 8400892208.

The previous prime is 21002230499. The next prime is 21002230541. The reversal of 21002230540 is 4503220012.

It is not an unprimeable number, because it can be changed into a prime (21002230541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 525055744 + ... + 525055783.

It is an arithmetic number, because the mean of its divisors is an integer number (3675390348).

Almost surely, 2^21002230540 is an apocalyptic number.

21002230540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002230540 is an abundant number, since it is smaller than the sum of its proper divisors (23102453636).

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

21002230540 is a wasteful number, since it uses less digits than its factorization.

21002230540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1050111536 (or 1050111534 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

Adding to 21002230540 its reverse (4503220012), we get a palindrome (25505450552).

The spelling of 21002230540 in words is "twenty-one billion, two million, two hundred thirty thousand, five hundred forty".