121330021220 has 24 divisors (see below), whose sum is σ = 254802900408. Its totient is φ = 48530131200.

The previous prime is 121330021151. The next prime is 121330021279. The reversal of 121330021220 is 22120033121.

It can be written as a sum of positive squares in 4 ways, for example, as 45123106084 + 76206915136 = 212422^2 + 276056^2 .

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, 489080 + ... + 694160.

It is an arithmetic number, because the mean of its divisors is an integer number (10616787517).

Almost surely, 2^121330021220 is an apocalyptic number.

121330021220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121330021220 is an abundant number, since it is smaller than the sum of its proper divisors (133472879188).

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

121330021220 is a wasteful number, since it uses less digits than its factorization.

121330021220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234671 (or 234669 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 121330021220 its reverse (22120033121), we get a palindrome (143450054341).

The spelling of 121330021220 in words is "one hundred twenty-one billion, three hundred thirty million, twenty-one thousand, two hundred twenty".