121221321123220 has 48 divisors (see below), whose sum is σ = 254802487822848. Its totient is φ = 48443252099840.

The previous prime is 121221321123179. The next prime is 121221321123223. The reversal of 121221321123220 is 22321123122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221321123223) by changing a digit.

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, 1456822857 + ... + 1456906063.

It is an arithmetic number, because the mean of its divisors is an integer number (5308385162976).

Almost surely, 2^{121221321123220} is an apocalyptic number.

121221321123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221321123220 is an abundant number, since it is smaller than the sum of its proper divisors (133581166699628).

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

121221321123220 is a wasteful number, since it uses less digits than its factorization.

121221321123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150360 (or 150358 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

Adding to 121221321123220 its reverse (22321123122121), we get a palindrome (143542444245341).

The spelling of 121221321123220 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred twenty".