1212210101221 has 8 divisors (see below), whose sum is σ = 1408864040640. Its totient is φ = 1021426428768.

The previous prime is 1212210101191. The next prime is 1212210101279. The reversal of 1212210101221 is 1221010122121.

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

It is not a de Polignac number, because 1212210101221 - 2⁷ = 1212210101093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212210101195 and 1212210101204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212210101321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1467566296 + ... + 1467567121.

It is an arithmetic number, because the mean of its divisors is an integer number (176108005080).

Almost surely, 2^{1212210101221} is an apocalyptic number.

It is an amenable number.

1212210101221 is a deficient number, since it is larger than the sum of its proper divisors (196653939419).

1212210101221 is an equidigital number, since it uses as much as digits as its factorization.

1212210101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935133483.

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

Adding to 1212210101221 its reverse (1221010122121), we get a palindrome (2433220223342).

The spelling of 1212210101221 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred one thousand, two hundred twenty-one".