121321030120020 has 72 divisors (see below), whose sum is σ = 371650759651080. Its totient is φ = 32031955142400.

The previous prime is 121321030119943. The next prime is 121321030120093. The reversal of 121321030120020 is 20021030123121.

121321030120020 is a `hidden beast` number, since 1 + 2 + 1 + 321 + 0 + 301 + 20 + 0 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 43163796247056 + 78157233872964 = 6569916^2 + 8840658^2 .

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 = 121321030119975 and 121321030120002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3336643815 + ... + 3336680174.

It is an arithmetic number, because the mean of its divisors is an integer number (5161816106265).

Almost surely, 2^{121321030120020} is an apocalyptic number.

121321030120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121321030120020 is an abundant number, since it is smaller than the sum of its proper divisors (250329729531060).

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

121321030120020 is a wasteful number, since it uses less digits than its factorization.

121321030120020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6673324105 (or 6673324100 counting only the distinct ones).

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

Adding to 121321030120020 its reverse (20021030123121), we get a palindrome (141342060243141).

The spelling of 121321030120020 in words is "one hundred twenty-one trillion, three hundred twenty-one billion, thirty million, one hundred twenty thousand, twenty".