222021220021 has 2 divisors, whose sum is σ = 222021220022. Its totient is φ = 222021220020.

The previous prime is 222021219977. The next prime is 222021220037. The reversal of 222021220021 is 120022120222.

It is an a-pointer prime, because the next prime (222021220037) can be obtained adding 222021220021 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216420344100 + 5600875921 = 465210^2 + 74839^2 .

It is a cyclic number.

It is not a de Polignac number, because 222021220021 - 2¹¹ = 222021217973 is a prime.

It is a super-2 number, since 2×222021220021² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 222021219977 and 222021220004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222021220061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111010610010 + 111010610011.

It is an arithmetic number, because the mean of its divisors is an integer number (111010610011).

Almost surely, 2^222021220021 is an apocalyptic number.

It is an amenable number.

222021220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222021220021 is an equidigital number, since it uses as much as digits as its factorization.

222021220021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 222021220021 its reverse (120022120222), we get a palindrome (342043340243).

The spelling of 222021220021 in words is "two hundred twenty-two billion, twenty-one million, two hundred twenty thousand, twenty-one".