221200012221021 has 16 divisors (see below), whose sum is σ = 327705517339200. Its totient is φ = 147465866825424.

The previous prime is 221200012220989. The next prime is 221200012221079. The reversal of 221200012221021 is 120122210002122.

It is a happy number.

221200012221021 is a `hidden beast` number, since 221 + 200 + 0 + 1 + 2 + 221 + 0 + 21 = 666.

It is not a de Polignac number, because 221200012221021 - 2⁵ = 221200012220989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221200012220985 and 221200012221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200012220021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17404506 + ... + 27300491.

It is an arithmetic number, because the mean of its divisors is an integer number (20481594833700).

Almost surely, 2^{221200012221021} is an apocalyptic number.

It is an amenable number.

221200012221021 is a deficient number, since it is larger than the sum of its proper divisors (106505505118179).

221200012221021 is a wasteful number, since it uses less digits than its factorization.

221200012221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44888265 (or 44888259 counting only the distinct ones).

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

Adding to 221200012221021 its reverse (120122210002122), we get a palindrome (341322222223143).

The spelling of 221200012221021 in words is "two hundred twenty-one trillion, two hundred billion, twelve million, two hundred twenty-one thousand, twenty-one".