121020121220 has 24 divisors (see below), whose sum is σ = 269091799704. Its totient is φ = 45560516096.

The previous prime is 121020121151. The next prime is 121020121319. The reversal of 121020121220 is 22121020121.

It can be written as a sum of positive squares in 4 ways, for example, as 11984118784 + 109036002436 = 109472^2 + 330206^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121020121195 and 121020121204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177970427 + ... + 177971106.

It is an arithmetic number, because the mean of its divisors is an integer number (11212158321).

Almost surely, 2^121020121220 is an apocalyptic number.

121020121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121020121220 is an abundant number, since it is smaller than the sum of its proper divisors (148071678484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121020121220 is a wasteful number, since it uses less digits than its factorization.

121020121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355941559 (or 355941557 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121020121220 its reverse (22121020121), we get a palindrome (143141141341).

The spelling of 121020121220 in words is "one hundred twenty-one billion, twenty million, one hundred twenty-one thousand, two hundred twenty".