1212021210121 has 8 divisors (see below), whose sum is σ = 1262190518784. Its totient is φ = 1162543892160.

The previous prime is 1212021210031. The next prime is 1212021210137. The reversal of 1212021210121 is 1210121202121.

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 1212021210121 - 2²⁹ = 1211484339209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212021210095 and 1212021210104.

It is not an unprimeable number, because it can be changed into a prime (1212021240121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172994101 + ... + 173001106.

It is an arithmetic number, because the mean of its divisors is an integer number (157773814848).

Almost surely, 2^{1212021210121} is an apocalyptic number.

It is an amenable number.

1212021210121 is a deficient number, since it is larger than the sum of its proper divisors (50169308663).

1212021210121 is a wasteful number, since it uses less digits than its factorization.

1212021210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345995351.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1212021210121 its reverse (1210121202121), we get a palindrome (2422142412242).

The spelling of 1212021210121 in words is "one trillion, two hundred twelve billion, twenty-one million, two hundred ten thousand, one hundred twenty-one".