121200002221021 has 4 divisors (see below), whose sum is σ = 121200025000572. Its totient is φ = 121199979441472.

The previous prime is 121200002220887. The next prime is 121200002221033. The reversal of 121200002221021 is 120122200002121.

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 109113463256121 + 12086538964900 = 10445739^2 + 3476570^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200002221021 - 2¹⁵ = 121200002188253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121200002220986 and 121200002221004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121200002221121) 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, 1314741 + ... + 15624613.

It is an arithmetic number, because the mean of its divisors is an integer number (30300006250143).

Almost surely, 2^{121200002221021} is an apocalyptic number.

It is an amenable number.

121200002221021 is a deficient number, since it is larger than the sum of its proper divisors (22779551).

121200002221021 is an equidigital number, since it uses as much as digits as its factorization.

121200002221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22779550.

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

Adding to 121200002221021 its reverse (120122200002121), we get a palindrome (241322202223142).

The spelling of 121200002221021 in words is "one hundred twenty-one trillion, two hundred billion, two million, two hundred twenty-one thousand, twenty-one".