1212200221121 has 8 divisors (see below), whose sum is σ = 1229615852544. Its totient is φ = 1194794100640.

The previous prime is 1212200221093. The next prime is 1212200221129. The reversal of 1212200221121 is 1211220022121.

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 1212200221121 - 2¹⁰ = 1212200220097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1212200221121.

It is not an unprimeable number, because it can be changed into a prime (1212200221129) 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, 2120801 + ... + 2631006.

It is an arithmetic number, because the mean of its divisors is an integer number (153701981568).

Almost surely, 2^{1212200221121} is an apocalyptic number.

It is an amenable number.

1212200221121 is a deficient number, since it is larger than the sum of its proper divisors (17415631423).

1212200221121 is an equidigital number, since it uses as much as digits as its factorization.

1212200221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4755471.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1212200221121 its reverse (1211220022121), we get a palindrome (2423420243242).

The spelling of 1212200221121 in words is "one trillion, two hundred twelve billion, two hundred million, two hundred twenty-one thousand, one hundred twenty-one".