121200211220220 has 96 divisors (see below), whose sum is σ = 411346171434240. Its totient is φ = 29381869385280.

The previous prime is 121200211220197. The next prime is 121200211220233. The reversal of 121200211220220 is 22022112002121.

It is a happy number.

121200211220220 is a `hidden beast` number, since 1 + 2 + 1 + 200 + 21 + 1 + 220 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 121200211220193 and 121200211220202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10202032042 + ... + 10202043921.

It is an arithmetic number, because the mean of its divisors is an integer number (4284855952440).

Almost surely, 2^{121200211220220} is an apocalyptic number.

121200211220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121200211220220 is an abundant number, since it is smaller than the sum of its proper divisors (290145960214020).

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

121200211220220 is a wasteful number, since it uses less digits than its factorization.

121200211220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20404075992 (or 20404075984 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121200211220220 its reverse (22022112002121), we get a palindrome (143222323222341).

The spelling of 121200211220220 in words is "one hundred twenty-one trillion, two hundred billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty".