21020013221330 has 16 divisors (see below), whose sum is σ = 37841554695384. Its totient is φ = 8406776200320.

The previous prime is 21020013221323. The next prime is 21020013221359. The reversal of 21020013221330 is 3312231002012.

It can be written as a sum of positive squares in 4 ways, for example, as 16713894357169 + 4306118864161 = 4088263^2 + 2075119^2 .

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, 153564197 + ... + 153701016.

Almost surely, 2^{21020013221330} is an apocalyptic number.

21020013221330 is a deficient number, since it is larger than the sum of its proper divisors (16821541474054).

21020013221330 is a wasteful number, since it uses less digits than its factorization.

21020013221330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307272061.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21020013221330 its reverse (3312231002012), we get a palindrome (24332244223342).

The spelling of 21020013221330 in words is "twenty-one trillion, twenty billion, thirteen million, two hundred twenty-one thousand, three hundred thirty".