21231221330 has 16 divisors (see below), whose sum is σ = 41690398464. Its totient is φ = 7720444080.

The previous prime is 21231221321. The next prime is 21231221339. The reversal of 21231221330 is 3312213212.

It is an interprime number because it is at equal distance from previous prime (21231221321) and next prime (21231221339).

It is not an unprimeable number, because it can be changed into a prime (21231221339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96505442 + ... + 96505661.

It is an arithmetic number, because the mean of its divisors is an integer number (2605649904).

Almost surely, 2^21231221330 is an apocalyptic number.

21231221330 is a deficient number, since it is larger than the sum of its proper divisors (20459177134).

21231221330 is a wasteful number, since it uses less digits than its factorization.

21231221330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193011121.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21231221330 its reverse (3312213212), we get a palindrome (24543434542).

The spelling of 21231221330 in words is "twenty-one billion, two hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty".