21102021330 has 64 divisors (see below), whose sum is σ = 54600255360. Its totient is φ = 5188663296.

The previous prime is 21102021329. The next prime is 21102021349. The reversal of 21102021330 is 3312020112.

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 31 ways as a sum of consecutive naturals, for example, 333189 + ... + 391431.

It is an arithmetic number, because the mean of its divisors is an integer number (853128990).

Almost surely, 2^21102021330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21102021330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27300127680).

21102021330 is an abundant number, since it is smaller than the sum of its proper divisors (33498234030).

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

21102021330 is a wasteful number, since it uses less digits than its factorization.

21102021330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59195.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21102021330 its reverse (3312020112), we get a palindrome (24414041442).

The spelling of 21102021330 in words is "twenty-one billion, one hundred two million, twenty-one thousand, three hundred thirty".