121220210021020 has 192 divisors, whose sum is σ = 285760440483840. Its totient is φ = 42806036736000.

The previous prime is 121220210021017. The next prime is 121220210021063. The reversal of 121220210021020 is 20120012022121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 121220210020985 and 121220210021003.

It is a congruent number.

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, 9547147312 + ... + 9547160008.

It is an arithmetic number, because the mean of its divisors is an integer number (1488335627520).

Almost surely, 2^{121220210021020} is an apocalyptic number.

121220210021020 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 121220210021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142880220241920).

121220210021020 is an abundant number, since it is smaller than the sum of its proper divisors (164540230462820).

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

121220210021020 is a wasteful number, since it uses less digits than its factorization.

121220210021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14924 (or 14922 counting only the distinct ones).

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

Adding to 121220210021020 its reverse (20120012022121), we get a palindrome (141340222043141).

The spelling of 121220210021020 in words is "one hundred twenty-one trillion, two hundred twenty billion, two hundred ten million, twenty-one thousand, twenty".