21030021330 has 16 divisors (see below), whose sum is σ = 50472051264. Its totient is φ = 5608005680.

The previous prime is 21030021317. The next prime is 21030021347. The reversal of 21030021330 is 3312003012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350500326 + ... + 350500385.

It is an arithmetic number, because the mean of its divisors is an integer number (3154503204).

Almost surely, 2^21030021330 is an apocalyptic number.

21030021330 is an abundant number, since it is smaller than the sum of its proper divisors (29442029934).

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

21030021330 is a wasteful number, since it uses less digits than its factorization.

21030021330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701000721.

The product of its (nonzero) digits is 108, while the sum is 15.

Adding to 21030021330 its reverse (3312003012), we get a palindrome (24342024342).

The spelling of 21030021330 in words is "twenty-one billion, thirty million, twenty-one thousand, three hundred thirty".