1212121022221 has 8 divisors (see below), whose sum is σ = 1212564184704. Its totient is φ = 1211677951920.

The previous prime is 1212121022219. The next prime is 1212121022239. The reversal of 1212121022221 is 1222201212121.

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 1212121022221 - 2¹ = 1212121022219 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 (1212121022521) 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, 35469675 + ... + 35503831.

It is an arithmetic number, because the mean of its divisors is an integer number (151570523088).

Almost surely, 2^{1212121022221} is an apocalyptic number.

It is an amenable number.

1212121022221 is a deficient number, since it is larger than the sum of its proper divisors (443162483).

1212121022221 is an equidigital number, since it uses as much as digits as its factorization.

1212121022221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46091.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1212121022221 its reverse (1222201212121), we get a palindrome (2434322234342).

The spelling of 1212121022221 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, twenty-two thousand, two hundred twenty-one".