21212221222330 has 32 divisors (see below), whose sum is σ = 38207257271424. Its totient is φ = 8479276174656.

The previous prime is 21212221222307. The next prime is 21212221222373. The reversal of 21212221222330 is 3322212221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212221222295 and 21212221222304.

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, 248189884 + ... + 248275336.

It is an arithmetic number, because the mean of its divisors is an integer number (1193976789732).

Almost surely, 2^{21212221222330} is an apocalyptic number.

21212221222330 is a deficient number, since it is larger than the sum of its proper divisors (16995036049094).

21212221222330 is a wasteful number, since it uses less digits than its factorization.

21212221222330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101590.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21212221222330 its reverse (3322212221212), we get a palindrome (24534433443542).

The spelling of 21212221222330 in words is "twenty-one trillion, two hundred twelve billion, two hundred twenty-one million, two hundred twenty-two thousand, three hundred thirty".