21220312221222 has 32 divisors (see below), whose sum is σ = 42608801952000. Its totient is φ = 7045420669728.

The previous prime is 21220312221209. The next prime is 21220312221233. The reversal of 21220312221222 is 22212221302212.

It is a super-2 number, since 2×21220312221222² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21220312221192 and 21220312221201.

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, 5012023 + ... + 8219549.

It is an arithmetic number, because the mean of its divisors is an integer number (1331525061000).

Almost surely, 2^{21220312221222} is an apocalyptic number.

21220312221222 is an abundant number, since it is smaller than the sum of its proper divisors (21388489730778).

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

21220312221222 is a wasteful number, since it uses less digits than its factorization.

21220312221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211900.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21220312221222 its reverse (22212221302212), we get a palindrome (43432533523434).

The spelling of 21220312221222 in words is "twenty-one trillion, two hundred twenty billion, three hundred twelve million, two hundred twenty-one thousand, two hundred twenty-two".