1212220202221 has 8 divisors (see below), whose sum is σ = 1430084662784. Its totient is φ = 1005528278160.

The previous prime is 1212220202197. The next prime is 1212220202243. The reversal of 1212220202221 is 1222020222121.

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

It is not a de Polignac number, because 1212220202221 - 2¹⁷ = 1212220071149 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 (1212220202261) 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, 2793133890 + ... + 2793134323.

It is an arithmetic number, because the mean of its divisors is an integer number (178760582848).

Almost surely, 2^{1212220202221} is an apocalyptic number.

It is an amenable number.

1212220202221 is a deficient number, since it is larger than the sum of its proper divisors (217864460563).

1212220202221 is an equidigital number, since it uses as much as digits as its factorization.

1212220202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5586268251.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1212220202221 its reverse (1222020222121), we get a palindrome (2434240424342).

The spelling of 1212220202221 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred two thousand, two hundred twenty-one".