121021202120020 has 48 divisors (see below), whose sum is σ = 254244330184320. Its totient is φ = 48389472625536.

The previous prime is 121021202120009. The next prime is 121021202120041. The reversal of 121021202120020 is 20021202120121.

It is a happy number.

It is a super-2 number, since 2×121021202120020² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021202119976 and 121021202120003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 917393826 + ... + 917525734.

It is an arithmetic number, because the mean of its divisors is an integer number (5296756878840).

Almost surely, 2^{121021202120020} is an apocalyptic number.

121021202120020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121021202120020 is an abundant number, since it is smaller than the sum of its proper divisors (133223128064300).

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

121021202120020 is a wasteful number, since it uses less digits than its factorization.

121021202120020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149584 (or 149582 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 121021202120020 its reverse (20021202120121), we get a palindrome (141042404240141).

The spelling of 121021202120020 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred two million, one hundred twenty thousand, twenty".