1212212220121 has 8 divisors (see below), whose sum is σ = 1404897865344. Its totient is φ = 1024404692640.

The previous prime is 1212212220071. The next prime is 1212212220133. The reversal of 1212212220121 is 1210222122121.

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

It is not a de Polignac number, because 1212212220121 - 2¹¹ = 1212212218073 is a prime.

It is a super-2 number, since 2×1212212220121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212212220521) 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, 1219528900 + ... + 1219529893.

It is an arithmetic number, because the mean of its divisors is an integer number (175612233168).

Almost surely, 2^{1212212220121} is an apocalyptic number.

It is an amenable number.

1212212220121 is a deficient number, since it is larger than the sum of its proper divisors (192685645223).

1212212220121 is an equidigital number, since it uses as much as digits as its factorization.

1212212220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439058871.

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

Adding to 1212212220121 its reverse (1210222122121), we get a palindrome (2422434342242).

The spelling of 1212212220121 in words is "one trillion, two hundred twelve billion, two hundred twelve million, two hundred twenty thousand, one hundred twenty-one".