21212203222320 has 160 divisors (see below), whose sum is σ = 71739852712704. Its totient is φ = 5142062822400.

The previous prime is 21212203222319. The next prime is 21212203222339. The reversal of 21212203222320 is 2322230221212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 48683830 + ... + 49117610.

Almost surely, 2^{21212203222320} is an apocalyptic number.

21212203222320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212203222320 is an abundant number, since it is smaller than the sum of its proper divisors (50527649490384).

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

21212203222320 is a wasteful number, since it uses less digits than its factorization.

21212203222320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 452331 (or 452325 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21212203222320 its reverse (2322230221212), we get a palindrome (23534433443532).

The spelling of 21212203222320 in words is "twenty-one trillion, two hundred twelve billion, two hundred three million, two hundred twenty-two thousand, three hundred twenty".