121220021121 has 32 divisors (see below), whose sum is σ = 168906855936. Its totient is φ = 77262336000.

The previous prime is 121220021107. The next prime is 121220021173. The reversal of 121220021121 is 121120022121.

It is not a de Polignac number, because 121220021121 - 2⁶ = 121220021057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121220021121.

It is not an unprimeable number, because it can be changed into a prime (121220021191) 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, 2003505 + ... + 2063121.

It is an arithmetic number, because the mean of its divisors is an integer number (5278339248).

Almost surely, 2^121220021121 is an apocalyptic number.

It is an amenable number.

121220021121 is a deficient number, since it is larger than the sum of its proper divisors (47686834815).

121220021121 is a wasteful number, since it uses less digits than its factorization.

121220021121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59993.

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

Adding to 121220021121 its reverse (121120022121), we get a palindrome (242340043242).

It can be divided in two parts, 1212200 and 21121, that added together give a palindrome (1233321).

The spelling of 121220021121 in words is "one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, one hundred twenty-one".