121221021320220 has 96 divisors (see below), whose sum is σ = 339819660907776. Its totient is φ = 32287455360000.

The previous prime is 121221021320219. The next prime is 121221021320261. The reversal of 121221021320220 is 22023120122121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 183486927 + ... + 184146393.

It is an arithmetic number, because the mean of its divisors is an integer number (3539788134456).

Almost surely, 2^{121221021320220} is an apocalyptic number.

121221021320220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221021320220 is an abundant number, since it is smaller than the sum of its proper divisors (218598639587556).

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

121221021320220 is a wasteful number, since it uses less digits than its factorization.

121221021320220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663091 (or 663089 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 121221021320220 its reverse (22023120122121), we get a palindrome (143244141442341).

The spelling of 121221021320220 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, three hundred twenty thousand, two hundred twenty".