1221020122121 has 8 divisors (see below), whose sum is σ = 1241628432000. Its totient is φ = 1200582835920.

The previous prime is 1221020122097. The next prime is 1221020122123. The reversal of 1221020122121 is 1212210201221.

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 1221020122121 - 2²⁶ = 1220953013257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1221020122121.

It is not an unprimeable number, because it can be changed into a prime (1221020122123) 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, 42741521 + ... + 42770078.

It is an arithmetic number, because the mean of its divisors is an integer number (155203554000).

Almost surely, 2^{1221020122121} is an apocalyptic number.

It is an amenable number.

1221020122121 is a deficient number, since it is larger than the sum of its proper divisors (20608309879).

1221020122121 is a wasteful number, since it uses less digits than its factorization.

1221020122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85511839.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221020122121 its reverse (1212210201221), we get a palindrome (2433230323342).

The spelling of 1221020122121 in words is "one trillion, two hundred twenty-one billion, twenty million, one hundred twenty-two thousand, one hundred twenty-one".