121221010121020 has 24 divisors (see below), whose sum is σ = 254587397211504. Its totient is φ = 48483970532736.

The previous prime is 121221010121017. The next prime is 121221010121021. The reversal of 121221010121020 is 20121010122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221010120985 and 121221010121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221010121021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276870522 + ... + 277308001.

It is an arithmetic number, because the mean of its divisors is an integer number (10607808217146).

Almost surely, 2^{121221010121020} is an apocalyptic number.

121221010121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221010121020 is an abundant number, since it is smaller than the sum of its proper divisors (133366387090484).

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

121221010121020 is a wasteful number, since it uses less digits than its factorization.

121221010121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554189469 (or 554189467 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121221010121020 its reverse (20121010122121), we get a palindrome (141342020243141).

The spelling of 121221010121020 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, ten million, one hundred twenty-one thousand, twenty".