1021221210121 has 16 divisors (see below), whose sum is σ = 1170975928320. Its totient is φ = 872433858240.

The previous prime is 1021221210103. The next prime is 1021221210197. The reversal of 1021221210121 is 1210121221201.

It is not a de Polignac number, because 1021221210121 - 2⁷ = 1021221209993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021221210095 and 1021221210104.

It is not an unprimeable number, because it can be changed into a prime (1021221210101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15586851 + ... + 15652231.

It is an arithmetic number, because the mean of its divisors is an integer number (73185995520).

Almost surely, 2^{1021221210121} is an apocalyptic number.

It is an amenable number.

1021221210121 is a deficient number, since it is larger than the sum of its proper divisors (149754718199).

1021221210121 is an equidigital number, since it uses as much as digits as its factorization.

1021221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72744.

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

Adding to 1021221210121 its reverse (1210121221201), we get a palindrome (2231342431322).

The spelling of 1021221210121 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".