121011211213220 has 24 divisors (see below), whose sum is σ = 260321678758008. Its totient is φ = 47223887302400.

The previous prime is 121011211213181. The next prime is 121011211213271. The reversal of 121011211213220 is 22312112110121.

It can be written as a sum of positive squares in 4 ways, for example, as 12796417075264 + 108214794137956 = 3577208^2 + 10402634^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 121011211213192 and 121011211213201.

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, 73787323091 + ... + 73787324730.

It is an arithmetic number, because the mean of its divisors is an integer number (10846736614917).

Almost surely, 2^{121011211213220} is an apocalyptic number.

121011211213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121011211213220 is an abundant number, since it is smaller than the sum of its proper divisors (139310467544788).

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

121011211213220 is a wasteful number, since it uses less digits than its factorization.

121011211213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147574647871 (or 147574647869 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 121011211213220 its reverse (22312112110121), we get a palindrome (143323323323341).

The spelling of 121011211213220 in words is "one hundred twenty-one trillion, eleven billion, two hundred eleven million, two hundred thirteen thousand, two hundred twenty".