21213220330 has 32 divisors (see below), whose sum is σ = 41734103040. Its totient is φ = 7728533760.

The previous prime is 21213220309. The next prime is 21213220333. The reversal of 21213220330 is 3302231212.

It is a junction number, because it is equal to n+sod(n) for n = 21213220298 and 21213220307.

It is not an unprimeable number, because it can be changed into a prime (21213220333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2007370 + ... + 2017909.

It is an arithmetic number, because the mean of its divisors is an integer number (1304190720).

Almost surely, 2^21213220330 is an apocalyptic number.

21213220330 is a deficient number, since it is larger than the sum of its proper divisors (20520882710).

21213220330 is a wasteful number, since it uses less digits than its factorization.

21213220330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4025334.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21213220330 its reverse (3302231212), we get a palindrome (24515451542).

The spelling of 21213220330 in words is "twenty-one billion, two hundred thirteen million, two hundred twenty thousand, three hundred thirty".