221200010222221 has 4 divisors (see below), whose sum is σ = 221221367769532. Its totient is φ = 221178652674912.

The previous prime is 221200010222203. The next prime is 221200010222251. The reversal of 221200010222221 is 122222010002122.

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 45422396868996 + 175777613353225 = 6739614^2 + 13258115^2 .

It is a cyclic number.

It is not a de Polignac number, because 221200010222221 - 2⁴⁷ = 80462521866893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200010222251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10678758120 + ... + 10678778833.

It is an arithmetic number, because the mean of its divisors is an integer number (55305341942383).

Almost surely, 2^{221200010222221} is an apocalyptic number.

It is an amenable number.

221200010222221 is a deficient number, since it is larger than the sum of its proper divisors (21357547311).

221200010222221 is a wasteful number, since it uses less digits than its factorization.

221200010222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21357547310.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221200010222221 its reverse (122222010002122), we get a palindrome (343422020224343).

The spelling of 221200010222221 in words is "two hundred twenty-one trillion, two hundred billion, ten million, two hundred twenty-two thousand, two hundred twenty-one".