21212452330 has 16 divisors (see below), whose sum is σ = 38184094944. Its totient is φ = 8484607440.

The previous prime is 21212452309. The next prime is 21212452333. The reversal of 21212452330 is 3325421212.

It is a junction number, because it is equal to n+sod(n) for n = 21212452295 and 21212452304.

It is not an unprimeable number, because it can be changed into a prime (21212452333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 363265 + ... + 417595.

It is an arithmetic number, because the mean of its divisors is an integer number (2386505934).

Almost surely, 2^21212452330 is an apocalyptic number.

21212452330 is a deficient number, since it is larger than the sum of its proper divisors (16971642614).

21212452330 is a wasteful number, since it uses less digits than its factorization.

21212452330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93381.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21212452330 its reverse (3325421212), we get a palindrome (24537873542).

The spelling of 21212452330 in words is "twenty-one billion, two hundred twelve million, four hundred fifty-two thousand, three hundred thirty".