21221132330 has 16 divisors (see below), whose sum is σ = 38246588640. Its totient is φ = 8477663952.

The previous prime is 21221132327. The next prime is 21221132369. The reversal of 21221132330 is 3323112212.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1340360 + ... + 1356099.

It is an arithmetic number, because the mean of its divisors is an integer number (2390411790).

Almost surely, 2^21221132330 is an apocalyptic number.

21221132330 is a deficient number, since it is larger than the sum of its proper divisors (17025456310).

21221132330 is a wasteful number, since it uses less digits than its factorization.

21221132330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2697253.

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

Adding to 21221132330 its reverse (3323112212), we get a palindrome (24544244542).

The spelling of 21221132330 in words is "twenty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, three hundred thirty".