21011031330 has 32 divisors (see below), whose sum is σ = 50538816000. Its totient is φ = 5590459392.

The previous prime is 21011031329. The next prime is 21011031337. The reversal of 21011031330 is 3313011012.

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 (21011031337) 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, 766450 + ... + 793389.

It is an arithmetic number, because the mean of its divisors is an integer number (1579338000).

Almost surely, 2^21011031330 is an apocalyptic number.

21011031330 is an abundant number, since it is smaller than the sum of its proper divisors (29527784670).

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

21011031330 is a wasteful number, since it uses less digits than its factorization.

21011031330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560298.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21011031330 its reverse (3313011012), we get a palindrome (24324042342).

The spelling of 21011031330 in words is "twenty-one billion, eleven million, thirty-one thousand, three hundred thirty".