121312013220 has 72 divisors (see below), whose sum is σ = 377925193464. Its totient is φ = 31475547648.

The previous prime is 121312013197. The next prime is 121312013239. The reversal of 121312013220 is 22310213121.

121312013220 is a `hidden beast` number, since 12 + 131 + 201 + 322 + 0 = 666.

121312013220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 36781102656 + 84530910564 = 191784^2 + 290742^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121312013193 and 121312013202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9100849 + ... + 9114168.

Almost surely, 2^121312013220 is an apocalyptic number.

121312013220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121312013220 is an abundant number, since it is smaller than the sum of its proper divisors (256613180244).

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

121312013220 is a wasteful number, since it uses less digits than its factorization.

121312013220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18215069 (or 18215064 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 121312013220 its reverse (22310213121), we get a palindrome (143622226341).

The spelling of 121312013220 in words is "one hundred twenty-one billion, three hundred twelve million, thirteen thousand, two hundred twenty".