1212220202121 has 32 divisors (see below), whose sum is σ = 1901915769600. Its totient is φ = 760451201280.

The previous prime is 1212220202041. The next prime is 1212220202147. The reversal of 1212220202121 is 1212020222121.

It is a happy number.

1212220202121 is a `hidden beast` number, since 1 + 212 + 220 + 20 + 212 + 1 = 666.

It is not a de Polignac number, because 1212220202121 - 2¹¹ = 1212220200073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212220202094 and 1212220202103.

It is not an unprimeable number, because it can be changed into a prime (1212220202161) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1964695 + ... + 2506883.

It is an arithmetic number, because the mean of its divisors is an integer number (59434867800).

Almost surely, 2^{1212220202121} is an apocalyptic number.

It is an amenable number.

1212220202121 is a deficient number, since it is larger than the sum of its proper divisors (689695567479).

1212220202121 is a wasteful number, since it uses less digits than its factorization.

1212220202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547086 (or 547080 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212220202121 its reverse (1212020222121), we get a palindrome (2424240424242).

The spelling of 1212220202121 in words is "one trillion, two hundred twelve billion, two hundred twenty million, two hundred two thousand, one hundred twenty-one".