222121023221 has 2 divisors, whose sum is σ = 222121023222. Its totient is φ = 222121023220.

The previous prime is 222121023217. The next prime is 222121023227. The reversal of 222121023221 is 122320121222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195022924996 + 27098098225 = 441614^2 + 164615^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121023221 - 2² = 222121023217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222121023193 and 222121023202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121023227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060511610 + 111060511611.

It is an arithmetic number, because the mean of its divisors is an integer number (111060511611).

Almost surely, 2^222121023221 is an apocalyptic number.

It is an amenable number.

222121023221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121023221 is an equidigital number, since it uses as much as digits as its factorization.

222121023221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 222121023221 its reverse (122320121222), we get a palindrome (344441144443).

The spelling of 222121023221 in words is "two hundred twenty-two billion, one hundred twenty-one million, twenty-three thousand, two hundred twenty-one".