1212221012021 has 8 divisors (see below), whose sum is σ = 1213155041280. Its totient is φ = 1211287232592.

The previous prime is 1212221012011. The next prime is 1212221012083. The reversal of 1212221012021 is 1202101222121.

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 1212221012021 - 2⁶ = 1212221011957 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 (1212221012011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10300316 + ... + 10417338.

It is an arithmetic number, because the mean of its divisors is an integer number (151644380160).

Almost surely, 2^{1212221012021} is an apocalyptic number.

It is an amenable number.

1212221012021 is a deficient number, since it is larger than the sum of its proper divisors (934029259).

1212221012021 is a wasteful number, since it uses less digits than its factorization.

1212221012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124915.

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

Adding to 1212221012021 its reverse (1202101222121), we get a palindrome (2414322234142).

The spelling of 1212221012021 in words is "one trillion, two hundred twelve billion, two hundred twenty-one million, twelve thousand, twenty-one".