121200012020221 has 4 divisors (see below), whose sum is σ = 121200114206844. Its totient is φ = 121199909833600.

The previous prime is 121200012020189. The next prime is 121200012020233. The reversal of 121200012020221 is 122020210002121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29218197808996 + 91981814211225 = 5405386^2 + 9590715^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200012020221 - 2⁵ = 121200012020189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200012020195 and 121200012020204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200012026221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49293070 + ... + 51693391.

It is an arithmetic number, because the mean of its divisors is an integer number (30300028551711).

Almost surely, 2^{121200012020221} is an apocalyptic number.

It is an amenable number.

121200012020221 is a deficient number, since it is larger than the sum of its proper divisors (102186623).

121200012020221 is a wasteful number, since it uses less digits than its factorization.

121200012020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102186622.

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

Adding to 121200012020221 its reverse (122020210002121), we get a palindrome (243220222022342).

The spelling of 121200012020221 in words is "one hundred twenty-one trillion, two hundred billion, twelve million, twenty thousand, two hundred twenty-one".