121220020120 has 64 divisors (see below), whose sum is σ = 280282324320. Its totient is φ = 47149599744.

The previous prime is 121220020109. The next prime is 121220020171. The reversal of 121220020120 is 21020022121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121220020120.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 2571079 + ... + 2617801.

Almost surely, 2^121220020120 is an apocalyptic number.

121220020120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220020120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140141162160).

121220020120 is an abundant number, since it is smaller than the sum of its proper divisors (159062304200).

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

121220020120 is a wasteful number, since it uses less digits than its factorization.

121220020120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48524 (or 48520 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121220020120 its reverse (21020022121), we get a palindrome (142240042241).

The spelling of 121220020120 in words is "one hundred twenty-one billion, two hundred twenty million, twenty thousand, one hundred twenty".