1213222223021 has 2 divisors, whose sum is σ = 1213222223022. Its totient is φ = 1213222223020.

The previous prime is 1213222222987. The next prime is 1213222223027. The reversal of 1213222223021 is 1203222223121.

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., 1015832173225 + 197390049796 = 1007885^2 + 444286^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213222223021 - 2²² = 1213218028717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213222223027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606611111510 + 606611111511.

It is an arithmetic number, because the mean of its divisors is an integer number (606611111511).

Almost surely, 2^{1213222223021} is an apocalyptic number.

It is an amenable number.

1213222223021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213222223021 is an equidigital number, since it uses as much as digits as its factorization.

1213222223021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 1213222223021 its reverse (1203222223121), we get a palindrome (2416444446142).

The spelling of 1213222223021 in words is "one trillion, two hundred thirteen billion, two hundred twenty-two million, two hundred twenty-three thousand, twenty-one".