121311242120 has 32 divisors (see below), whose sum is σ = 282362376600. Its totient is φ = 46851237888.

The previous prime is 121311242119. The next prime is 121311242131. The reversal of 121311242120 is 21242113121.

It can be written as a sum of positive squares in 4 ways, for example, as 112824779236 + 8486462884 = 335894^2 + 92122^2 .

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 = 121311242092 and 121311242101.

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, 52288169 + ... + 52290488.

Almost surely, 2^121311242120 is an apocalyptic number.

121311242120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121311242120 is an abundant number, since it is smaller than the sum of its proper divisors (161051134480).

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

121311242120 is a wasteful number, since it uses less digits than its factorization.

121311242120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104578697 (or 104578693 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 121311242120 its reverse (21242113121), we get a palindrome (142553355241).

The spelling of 121311242120 in words is "one hundred twenty-one billion, three hundred eleven million, two hundred forty-two thousand, one hundred twenty".