1221013010213 has 2 divisors, whose sum is σ = 1221013010214. Its totient is φ = 1221013010212.

The previous prime is 1221013010201. The next prime is 1221013010219. The reversal of 1221013010213 is 3120103101221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1184860551169 + 36152459044 = 1088513^2 + 190138^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221013010213 - 2¹⁸ = 1221012748069 is a prime.

It is a super-2 number, since 2×1221013010213² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221013010191 and 1221013010200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221013010219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610506505106 + 610506505107.

It is an arithmetic number, because the mean of its divisors is an integer number (610506505107).

Almost surely, 2^{1221013010213} is an apocalyptic number.

It is an amenable number.

1221013010213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221013010213 is an equidigital number, since it uses as much as digits as its factorization.

1221013010213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1221013010213 its reverse (3120103101221), we get a palindrome (4341116111434).

The spelling of 1221013010213 in words is "one trillion, two hundred twenty-one billion, thirteen million, ten thousand, two hundred thirteen".