121021102020 has 192 divisors, whose sum is σ = 418033115136. Its totient is φ = 25474383360.

The previous prime is 121021102003. The next prime is 121021102043. The reversal of 121021102020 is 20201120121.

It is a super-2 number, since 2×121021102020² (a number of 23 digits) contains 22 as substring.

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 = 121021101987 and 121021102005.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2327547 + ... + 2378973.

It is an arithmetic number, because the mean of its divisors is an integer number (2177255808).

Almost surely, 2^121021102020 is an apocalyptic number.

121021102020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121021102020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209016557568).

121021102020 is an abundant number, since it is smaller than the sum of its proper divisors (297012013116).

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

121021102020 is a wasteful number, since it uses less digits than its factorization.

121021102020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51890 (or 51888 counting only the distinct ones).

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

Adding to 121021102020 its reverse (20201120121), we get a palindrome (141222222141).

The spelling of 121021102020 in words is "one hundred twenty-one billion, twenty-one million, one hundred two thousand, twenty".