21213232330 has 32 divisors (see below), whose sum is σ = 39641225040. Its totient is φ = 8163509760.

The previous prime is 21213232321. The next prime is 21213232357. The reversal of 21213232330 is 3323231212.

It can be written as a sum of positive squares in 8 ways, for example, as 5958759249 + 15254473081 = 77193^2 + 123509^2 .

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, 48669 + ... + 211648.

Almost surely, 2^21213232330 is an apocalyptic number.

21213232330 is a deficient number, since it is larger than the sum of its proper divisors (18427992710).

21213232330 is a wasteful number, since it uses less digits than its factorization.

21213232330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260634.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21213232330 its reverse (3323231212), we get a palindrome (24536463542).

The spelling of 21213232330 in words is "twenty-one billion, two hundred thirteen million, two hundred thirty-two thousand, three hundred thirty".