121201220100020 has 24 divisors (see below), whose sum is σ = 262732967443968. Its totient is φ = 46916601328800.

The previous prime is 121201220099969. The next prime is 121201220100089. The reversal of 121201220100020 is 20001022102121.

It is a junction number, because it is equal to n+sod(n) for n = 121201220099968 and 121201220100004.

It is a congruent number.

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, 97742918816 + ... + 97742920055.

It is an arithmetic number, because the mean of its divisors is an integer number (10947206976832).

Almost surely, 2^{121201220100020} is an apocalyptic number.

121201220100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121201220100020 is an abundant number, since it is smaller than the sum of its proper divisors (141531747343948).

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

121201220100020 is a wasteful number, since it uses less digits than its factorization.

121201220100020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195485838911 (or 195485838909 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 121201220100020 its reverse (20001022102121), we get a palindrome (141202242202141).

The spelling of 121201220100020 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred twenty million, one hundred thousand, twenty".