1222012021 has 2 divisors, whose sum is σ = 1222012022. Its totient is φ = 1222012020.

The previous prime is 1222011977. The next prime is 1222012031. The reversal of 1222012021 is 1202102221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 827195121 + 394816900 = 28761^2 + 19870^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222012021 - 2¹⁹ = 1221487733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1222011992 and 1222012010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222012031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611006010 + 611006011.

It is an arithmetic number, because the mean of its divisors is an integer number (611006011).

Almost surely, 2^1222012021 is an apocalyptic number.

It is an amenable number.

1222012021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222012021 is an equidigital number, since it uses as much as digits as its factorization.

1222012021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1222012021 is about 34957.2885247126. The cubic root of 1222012021 is about 1069.1168130630.

Adding to 1222012021 its reverse (1202102221), we get a palindrome (2424114242).

The spelling of 1222012021 in words is "one billion, two hundred twenty-two million, twelve thousand, twenty-one".