221202011 has 8 divisors (see below), whose sum is σ = 239927184. Its totient is φ = 203111680.

The previous prime is 221201999. The next prime is 221202013. The reversal of 221202011 is 110202122.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221202011 - 2¹⁸ = 220939867 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221201983 and 221202001.

It is not an unprimeable number, because it can be changed into a prime (221202013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 157985 + ... + 159378.

It is an arithmetic number, because the mean of its divisors is an integer number (29990898).

Almost surely, 2^221202011 is an apocalyptic number.

221202011 is a deficient number, since it is larger than the sum of its proper divisors (18725173).

221202011 is a wasteful number, since it uses less digits than its factorization.

221202011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317421.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221202011 is about 14872.8615605740. The cubic root of 221202011 is about 604.7785187514.

Adding to 221202011 its reverse (110202122), we get a palindrome (331404133).

The spelling of 221202011 in words is "two hundred twenty-one million, two hundred two thousand, eleven".