121200111021220 has 192 divisors, whose sum is σ = 320489138737152. Its totient is φ = 37399901760000.

The previous prime is 121200111021133. The next prime is 121200111021221. The reversal of 121200111021220 is 22120111002121.

It is a super-2 number, since 2×121200111021220² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121200111021194 and 121200111021203.

It is not an unprimeable number, because it can be changed into a prime (121200111021221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3579114009 + ... + 3579147871.

It is an arithmetic number, because the mean of its divisors is an integer number (1669214264256).

Almost surely, 2^{121200111021220} is an apocalyptic number.

121200111021220 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 121200111021220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (160244569368576).

121200111021220 is an abundant number, since it is smaller than the sum of its proper divisors (199289027715932).

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

121200111021220 is a wasteful number, since it uses less digits than its factorization.

121200111021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57002 (or 57000 counting only the distinct ones).

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

Adding to 121200111021220 its reverse (22120111002121), we get a palindrome (143320222023341).

It can be divided in two parts, 1212001 and 11021220, that added together give a palindrome (12233221).

The spelling of 121200111021220 in words is "one hundred twenty-one trillion, two hundred billion, one hundred eleven million, twenty-one thousand, two hundred twenty".