121023031220 has 72 divisors (see below), whose sum is σ = 318383700264. Its totient is φ = 38301790464.

The previous prime is 121023031201. The next prime is 121023031253. The reversal of 121023031220 is 22130320121.

It can be written as a sum of positive squares in 4 ways, for example, as 28881642916 + 92141388304 = 169946^2 + 303548^2 .

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 23 ways as a sum of consecutive naturals, for example, 4736987 + ... + 4762466.

It is an arithmetic number, because the mean of its divisors is an integer number (4421995837).

Almost surely, 2^121023031220 is an apocalyptic number.

121023031220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121023031220 is an abundant number, since it is smaller than the sum of its proper divisors (197360669044).

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

121023031220 is a wasteful number, since it uses less digits than its factorization.

121023031220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9499489 (or 9499480 counting only the distinct ones).

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

Adding to 121023031220 its reverse (22130320121), we get a palindrome (143153351341).

The spelling of 121023031220 in words is "one hundred twenty-one billion, twenty-three million, thirty-one thousand, two hundred twenty".