21021203331330 has 32 divisors (see below), whose sum is σ = 50451046392384. Its totient is φ = 5605636622016.

The previous prime is 21021203331299. The next prime is 21021203331341. The reversal of 21021203331330 is 3313330212012.

It is a self number, because there is not a number n which added to its sum of digits gives 21021203331330.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10684092 + ... + 12497688.

It is an arithmetic number, because the mean of its divisors is an integer number (1576595199762).

Almost surely, 2^{21021203331330} is an apocalyptic number.

21021203331330 is an abundant number, since it is smaller than the sum of its proper divisors (29429843061054).

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

21021203331330 is a wasteful number, since it uses less digits than its factorization.

21021203331330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2199970.

The product of its (nonzero) digits is 1944, while the sum is 24.

Adding to 21021203331330 its reverse (3313330212012), we get a palindrome (24334533543342).

The spelling of 21021203331330 in words is "twenty-one trillion, twenty-one billion, two hundred three million, three hundred thirty-one thousand, three hundred thirty".