121221101201020 has 48 divisors (see below), whose sum is σ = 256945884991488. Its totient is φ = 48034816331840.

The previous prime is 121221101201003. The next prime is 121221101201027. The reversal of 121221101201020 is 20102101122121.

It is a junction number, because it is equal to n+sod(n) for n = 121221101200985 and 121221101201003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221101201027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 300303525 + ... + 300706915.

It is an arithmetic number, because the mean of its divisors is an integer number (5353039270656).

Almost surely, 2^{121221101201020} is an apocalyptic number.

121221101201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121221101201020 is an abundant number, since it is smaller than the sum of its proper divisors (135724783790468).

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

121221101201020 is a wasteful number, since it uses less digits than its factorization.

121221101201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543930 (or 543928 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 121221101201020 its reverse (20102101122121), we get a palindrome (141323202323141).

The spelling of 121221101201020 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred one million, two hundred one thousand, twenty".