121021202020 has 24 divisors (see below), whose sum is σ = 254163349944. Its totient is φ = 48404894976.

The previous prime is 121021201981. The next prime is 121021202051. The reversal of 121021202020 is 20202120121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93698434404 + 27322767616 = 306102^2 + 165296^2 .

It is a super-2 number, since 2×121021202020² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61512 + ... + 495808.

It is an arithmetic number, because the mean of its divisors is an integer number (10590139581).

Almost surely, 2^121021202020 is an apocalyptic number.

121021202020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021202020 is an abundant number, since it is smaller than the sum of its proper divisors (133142147924).

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

121021202020 is a wasteful number, since it uses less digits than its factorization.

121021202020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448239 (or 448237 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 121021202020 its reverse (20202120121), we get a palindrome (141223322141).

The spelling of 121021202020 in words is "one hundred twenty-one billion, twenty-one million, two hundred two thousand, twenty".