1221010012213 has 2 divisors, whose sum is σ = 1221010012214. Its totient is φ = 1221010012212.

The previous prime is 1221010012147. The next prime is 1221010012289. The reversal of 1221010012213 is 3122100101221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1087917839089 + 133092173124 = 1043033^2 + 364818^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221010012213 - 2⁹ = 1221010011701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221010015213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610505006106 + 610505006107.

It is an arithmetic number, because the mean of its divisors is an integer number (610505006107).

Almost surely, 2^{1221010012213} is an apocalyptic number.

It is an amenable number.

1221010012213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221010012213 is an equidigital number, since it uses as much as digits as its factorization.

1221010012213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221010012213 its reverse (3122100101221), we get a palindrome (4343110113434).

The spelling of 1221010012213 in words is "one trillion, two hundred twenty-one billion, ten million, twelve thousand, two hundred thirteen".