121210021020 has 48 divisors (see below), whose sum is σ = 370241520768. Its totient is φ = 29384247360.

The previous prime is 121210021019. The next prime is 121210021073. The reversal of 121210021020 is 20120012121.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 121210020987 and 121210021005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91825114 + ... + 91826433.

It is an arithmetic number, because the mean of its divisors is an integer number (7713365016).

Almost surely, 2^121210021020 is an apocalyptic number.

121210021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121210021020 is an abundant number, since it is smaller than the sum of its proper divisors (249031499748).

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

121210021020 is a wasteful number, since it uses less digits than its factorization.

121210021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183651570 (or 183651568 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121210021020 its reverse (20120012121), we get a palindrome (141330033141).

The spelling of 121210021020 in words is "one hundred twenty-one billion, two hundred ten million, twenty-one thousand, twenty".