1211212220213 has 8 divisors (see below), whose sum is σ = 1217328899736. Its totient is φ = 1205108352000.

The previous prime is 1211212220209. The next prime is 1211212220219. The reversal of 1211212220213 is 3120222121121.

It can be written as a sum of positive squares in 4 ways, for example, as 533517758929 + 677694461284 = 730423^2 + 823222^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211212220213 - 2² = 1211212220209 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211212220219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3013238 + ... + 3391463.

It is an arithmetic number, because the mean of its divisors is an integer number (152166112467).

Almost surely, 2^{1211212220213} is an apocalyptic number.

It is an amenable number.

1211212220213 is a deficient number, since it is larger than the sum of its proper divisors (6116679523).

1211212220213 is an equidigital number, since it uses as much as digits as its factorization.

1211212220213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6405655.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1211212220213 its reverse (3120222121121), we get a palindrome (4331434341334).

The spelling of 1211212220213 in words is "one trillion, two hundred eleven billion, two hundred twelve million, two hundred twenty thousand, two hundred thirteen".