21220221201212 has 48 divisors (see below), whose sum is σ = 40964425729920. Its totient is φ = 9537918216000.

The previous prime is 21220221201197. The next prime is 21220221201259. The reversal of 21220221201212 is 21210212202212.

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, 463739 + ... + 6531117.

It is an arithmetic number, because the mean of its divisors is an integer number (853425536040).

Almost surely, 2^{21220221201212} is an apocalyptic number.

21220221201212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21220221201212 is a deficient number, since it is larger than the sum of its proper divisors (19744204528708).

21220221201212 is a wasteful number, since it uses less digits than its factorization.

21220221201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6068282 (or 6068280 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21220221201212 its reverse (21210212202212), we get a palindrome (42430433403424).

The spelling of 21220221201212 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred one thousand, two hundred twelve".