21212203322 has 32 divisors (see below), whose sum is σ = 34549016832. Its totient is φ = 9728699904.

The previous prime is 21212203297. The next prime is 21212203349. The reversal of 21212203322 is 22330221212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21212203294 and 21212203303.

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, 661238 + ... + 692574.

It is an arithmetic number, because the mean of its divisors is an integer number (1079656776).

Almost surely, 2^21212203322 is an apocalyptic number.

21212203322 is a deficient number, since it is larger than the sum of its proper divisors (13336813510).

21212203322 is a wasteful number, since it uses less digits than its factorization.

21212203322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31862.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21212203322 its reverse (22330221212), we get a palindrome (43542424534).

The spelling of 21212203322 in words is "twenty-one billion, two hundred twelve million, two hundred three thousand, three hundred twenty-two".