1221212213213 has 8 divisors (see below), whose sum is σ = 1247265267840. Its totient is φ = 1195162067680.

The previous prime is 1221212213203. The next prime is 1221212213219. The reversal of 1221212213213 is 3123122121221.

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 1221212213213 - 2¹⁴ = 1221212196829 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 (1221212213219) 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, 131978 + ... + 1568388.

It is an arithmetic number, because the mean of its divisors is an integer number (155908158480).

Almost surely, 2^{1221212213213} is an apocalyptic number.

It is an amenable number.

1221212213213 is a deficient number, since it is larger than the sum of its proper divisors (26053054627).

1221212213213 is a wasteful number, since it uses less digits than its factorization.

1221212213213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454547.

The product of its digits is 576, while the sum is 23.

Adding to 1221212213213 its reverse (3123122121221), we get a palindrome (4344334334434).

The spelling of 1221212213213 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, two hundred thirteen thousand, two hundred thirteen".