221200121220021 has 48 divisors (see below), whose sum is σ = 357015972702720. Its totient is φ = 135198715671360.

The previous prime is 221200121220019. The next prime is 221200121220131. The reversal of 221200121220021 is 120022121002122.

It is a happy number.

221200121220021 is a `hidden beast` number, since 221 + 200 + 1 + 2 + 1 + 220 + 0 + 21 = 666.

221200121220021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221200121220021 - 2¹ = 221200121220019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221200121219976 and 221200121220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200121220521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 365732920 + ... + 366337233.

It is an arithmetic number, because the mean of its divisors is an integer number (7437832764640).

Almost surely, 2^{221200121220021} is an apocalyptic number.

It is an amenable number.

221200121220021 is a deficient number, since it is larger than the sum of its proper divisors (135815851482699).

221200121220021 is a wasteful number, since it uses less digits than its factorization.

221200121220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 732070231 (or 732070206 counting only the distinct ones).

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

Adding to 221200121220021 its reverse (120022121002122), we get a palindrome (341222242222143).

The spelling of 221200121220021 in words is "two hundred twenty-one trillion, two hundred billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".