21111331330 has 16 divisors (see below), whose sum is σ = 38427368760. Its totient is φ = 8349649792.

The previous prime is 21111331309. The next prime is 21111331349. The reversal of 21111331330 is 3313311112.

It can be written as a sum of positive squares in 4 ways, for example, as 9581081689 + 11530249641 = 97883^2 + 107379^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21111331298 and 21111331307.

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, 11859409 + ... + 11861188.

Almost surely, 2^21111331330 is an apocalyptic number.

21111331330 is a deficient number, since it is larger than the sum of its proper divisors (17316037430).

21111331330 is a wasteful number, since it uses less digits than its factorization.

21111331330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23720693.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21111331330 its reverse (3313311112), we get a palindrome (24424642442).

The spelling of 21111331330 in words is "twenty-one billion, one hundred eleven million, three hundred thirty-one thousand, three hundred thirty".