21212110330 has 8 divisors (see below), whose sum is σ = 38181798612. Its totient is φ = 8484844128.

The previous prime is 21212110327. The next prime is 21212110373. The reversal of 21212110330 is 3301121212.

It can be written as a sum of positive squares in 2 ways, for example, as 21162393729 + 49716601 = 145473^2 + 7051^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21212110330³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060605507 + ... + 1060605526.

Almost surely, 2^21212110330 is an apocalyptic number.

21212110330 is a deficient number, since it is larger than the sum of its proper divisors (16969688282).

21212110330 is a wasteful number, since it uses less digits than its factorization.

21212110330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121211040.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21212110330 its reverse (3301121212), we get a palindrome (24513231542).

The spelling of 21212110330 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, three hundred thirty".