121210220121 has 32 divisors (see below), whose sum is σ = 164975616000. Its totient is φ = 79140868224.

The previous prime is 121210220113. The next prime is 121210220123. The reversal of 121210220121 is 121022012121.

It is not a de Polignac number, because 121210220121 - 2³ = 121210220113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121210220121.

It is not an unprimeable number, because it can be changed into a prime (121210220123) 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, 40415380 + ... + 40418378.

It is an arithmetic number, because the mean of its divisors is an integer number (5155488000).

Almost surely, 2^121210220121 is an apocalyptic number.

It is an amenable number.

121210220121 is a deficient number, since it is larger than the sum of its proper divisors (43765395879).

121210220121 is a wasteful number, since it uses less digits than its factorization.

121210220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4165.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121210220121 its reverse (121022012121), we get a palindrome (242232232242).

The spelling of 121210220121 in words is "one hundred twenty-one billion, two hundred ten million, two hundred twenty thousand, one hundred twenty-one".