1212111120221 has 8 divisors (see below), whose sum is σ = 1216488725088. Its totient is φ = 1207740618000.

The previous prime is 1212111120211. The next prime is 1212111120251. The reversal of 1212111120221 is 1220211112121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212111120221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212111120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212111120211) 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, 1433615 + ... + 2116476.

It is an arithmetic number, because the mean of its divisors is an integer number (152061090636).

Almost surely, 2^{1212111120221} is an apocalyptic number.

It is an amenable number.

1212111120221 is a deficient number, since it is larger than the sum of its proper divisors (4377604867).

1212111120221 is an equidigital number, since it uses as much as digits as its factorization.

1212111120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3551323.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1212111120221 its reverse (1220211112121), we get a palindrome (2432322232342).

The spelling of 1212111120221 in words is "one trillion, two hundred twelve billion, one hundred eleven million, one hundred twenty thousand, two hundred twenty-one".