21002303040 has 56 divisors (see below), whose sum is σ = 66682315200. Its totient is φ = 5600613888.

The previous prime is 21002303009. The next prime is 21002303041. The reversal of 21002303040 is 4030320012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21002303041) 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 7 ways as a sum of consecutive naturals, for example, 10937740 + ... + 10939659.

Almost surely, 2^21002303040 is an apocalyptic number.

21002303040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002303040 is an abundant number, since it is smaller than the sum of its proper divisors (45680012160).

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

21002303040 is a wasteful number, since it uses less digits than its factorization.

21002303040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21877419 (or 21877409 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

Adding to 21002303040 its reverse (4030320012), we get a palindrome (25032623052).

The spelling of 21002303040 in words is "twenty-one billion, two million, three hundred three thousand, forty".