21030040304 has 120 divisors (see below), whose sum is σ = 51139383120. Its totient is φ = 8304049152.

The previous prime is 21030040259. The next prime is 21030040319. The reversal of 21030040304 is 40304003012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6551852 + ... + 6555060.

It is an arithmetic number, because the mean of its divisors is an integer number (426161526).

Almost surely, 2^21030040304 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21030040304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25569691560).

21030040304 is an abundant number, since it is smaller than the sum of its proper divisors (30109342816).

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

21030040304 is a wasteful number, since it uses less digits than its factorization.

21030040304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3887 (or 3874 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

Adding to 21030040304 its reverse (40304003012), we get a palindrome (61334043316).

The spelling of 21030040304 in words is "twenty-one billion, thirty million, forty thousand, three hundred four".