21222212303220 has 24 divisors (see below), whose sum is σ = 59422194449184. Its totient is φ = 5659256614176.

The previous prime is 21222212303197. The next prime is 21222212303249. The reversal of 21222212303220 is 2230321222212.

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, 176851769134 + ... + 176851769253.

It is an arithmetic number, because the mean of its divisors is an integer number (2475924768716).

Almost surely, 2^{21222212303220} is an apocalyptic number.

21222212303220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222212303220 is an abundant number, since it is smaller than the sum of its proper divisors (38199982145964).

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

21222212303220 is a wasteful number, since it uses less digits than its factorization.

21222212303220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353703538399 (or 353703538397 counting only the distinct ones).

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

Adding to 21222212303220 its reverse (2230321222212), we get a palindrome (23452533525432).

The spelling of 21222212303220 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twelve million, three hundred three thousand, two hundred twenty".