1212120020221 has 8 divisors (see below), whose sum is σ = 1322509222944. Its totient is φ = 1101763563120.

The previous prime is 1212120020213. The next prime is 1212120020249. The reversal of 1212120020221 is 1220200212121.

It is a happy number.

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

It is not a de Polignac number, because 1212120020221 - 2³ = 1212120020213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212120020195 and 1212120020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120020261) 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, 8108971 + ... + 8257096.

It is an arithmetic number, because the mean of its divisors is an integer number (165313652868).

Almost surely, 2^{1212120020221} is an apocalyptic number.

1212120020221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212120020221 is a deficient number, since it is larger than the sum of its proper divisors (110389202723).

1212120020221 is a wasteful number, since it uses less digits than its factorization.

1212120020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16372811.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1212120020221 its reverse (1220200212121), we get a palindrome (2432320232342).

The spelling of 1212120020221 in words is "one trillion, two hundred twelve billion, one hundred twenty million, twenty thousand, two hundred twenty-one".