221021201201 has 4 divisors (see below), whose sum is σ = 221025824292. Its totient is φ = 221016578112.

The previous prime is 221021201161. The next prime is 221021201209. The reversal of 221021201201 is 102102120122.

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 20786430625 + 200234770576 = 144175^2 + 447476^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221021201201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221021201209) 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, 2239076 + ... + 2335701.

It is an arithmetic number, because the mean of its divisors is an integer number (55256456073).

Almost surely, 2^221021201201 is an apocalyptic number.

It is an amenable number.

221021201201 is a deficient number, since it is larger than the sum of its proper divisors (4623091).

221021201201 is an equidigital number, since it uses as much as digits as its factorization.

221021201201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4623090.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221021201201 its reverse (102102120122), we get a palindrome (323123321323).

The spelling of 221021201201 in words is "two hundred twenty-one billion, twenty-one million, two hundred one thousand, two hundred one".