21222331320 has 32 divisors (see below), whose sum is σ = 63666994320. Its totient is φ = 5659288320.

The previous prime is 21222331307. The next prime is 21222331343. The reversal of 21222331320 is 2313322212.

It is a happy number.

It is a congruent 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, 88426261 + ... + 88426500.

Almost surely, 2^21222331320 is an apocalyptic number.

21222331320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222331320 is an abundant number, since it is smaller than the sum of its proper divisors (42444663000).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21222331320 is a wasteful number, since it uses less digits than its factorization.

21222331320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176852775 (or 176852771 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21222331320 its reverse (2313322212), we get a palindrome (23535653532).

The spelling of 21222331320 in words is "twenty-one billion, two hundred twenty-two million, three hundred thirty-one thousand, three hundred twenty".