21103312330 has 16 divisors (see below), whose sum is σ = 38334459240. Its totient is φ = 8363881152.

The previous prime is 21103312327. The next prime is 21103312367. The reversal of 21103312330 is 3321330112.

It can be written as a sum of positive squares in 4 ways, for example, as 16558799761 + 4544512569 = 128681^2 + 67413^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21103312298 and 21103312307.

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, 9679329 + ... + 9681508.

Almost surely, 2^21103312330 is an apocalyptic number.

21103312330 is a deficient number, since it is larger than the sum of its proper divisors (17231146910).

21103312330 is a wasteful number, since it uses less digits than its factorization.

21103312330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19360953.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21103312330 its reverse (3321330112), we get a palindrome (24424642442).

The spelling of 21103312330 in words is "twenty-one billion, one hundred three million, three hundred twelve thousand, three hundred thirty".