20120122223221 has 2 divisors, whose sum is σ = 20120122223222. Its totient is φ = 20120122223220.

The previous prime is 20120122223183. The next prime is 20120122223287. The reversal of 20120122223221 is 12232222102102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14864772296196 + 5255349927025 = 3855486^2 + 2292455^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120122223221 - 2²⁷ = 20119988005493 is a prime.

It is a super-2 number, since 2×20120122223221² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20120122223192 and 20120122223201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120122223821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060061111610 + 10060061111611.

It is an arithmetic number, because the mean of its divisors is an integer number (10060061111611).

Almost surely, 2^{20120122223221} is an apocalyptic number.

It is an amenable number.

20120122223221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120122223221 is an equidigital number, since it uses as much as digits as its factorization.

20120122223221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 20120122223221 its reverse (12232222102102), we get a palindrome (32352344325323).

The spelling of 20120122223221 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-two million, two hundred twenty-three thousand, two hundred twenty-one".