21030303040 has 112 divisors (see below), whose sum is σ = 51297840000. Its totient is φ = 8209631232.

The previous prime is 21030303031. The next prime is 21030303043. The reversal of 21030303040 is 4030303012.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030303043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2332461 + ... + 2341459.

Almost surely, 2^21030303040 is an apocalyptic number.

21030303040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030303040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25648920000).

21030303040 is an abundant number, since it is smaller than the sum of its proper divisors (30267536960).

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

21030303040 is a wasteful number, since it uses less digits than its factorization.

21030303040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9192 (or 9182 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 16.

Adding to 21030303040 its reverse (4030303012), we get a palindrome (25060606052).

The spelling of 21030303040 in words is "twenty-one billion, thirty million, three hundred three thousand, forty".