21212232330 has 32 divisors (see below), whose sum is σ = 51553785600. Its totient is φ = 5584992192.

The previous prime is 21212232317. The next prime is 21212232343. The reversal of 21212232330 is 3323221212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21212232317) and next prime (21212232343).

It is a junction number, because it is equal to n+sod(n) for n = 21212232297 and 21212232306.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4472785 + ... + 4477524.

It is an arithmetic number, because the mean of its divisors is an integer number (1611055800).

Almost surely, 2^21212232330 is an apocalyptic number.

21212232330 is an abundant number, since it is smaller than the sum of its proper divisors (30341553270).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212232330 is a wasteful number, since it uses less digits than its factorization.

21212232330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8950398.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21212232330 its reverse (3323221212), we get a palindrome (24535453542).

The spelling of 21212232330 in words is "twenty-one billion, two hundred twelve million, two hundred thirty-two thousand, three hundred thirty".