21331221230 has 32 divisors (see below), whose sum is σ = 42460568928. Its totient is φ = 7650547200.

The previous prime is 21331221217. The next prime is 21331221271. The reversal of 21331221230 is 3212213312.

It is a congruent number.

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, 1320191 + ... + 1336250.

It is an arithmetic number, because the mean of its divisors is an integer number (1326892779).

Almost surely, 2^21331221230 is an apocalyptic number.

21331221230 is a deficient number, since it is larger than the sum of its proper divisors (21129347698).

21331221230 is a wasteful number, since it uses less digits than its factorization.

21331221230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656532.

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

Adding to 21331221230 its reverse (3212213312), we get a palindrome (24543434542).

The spelling of 21331221230 in words is "twenty-one billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty".