221221201011 has 16 divisors (see below), whose sum is σ = 295425619200. Its totient is φ = 147248956448.

The previous prime is 221221200997. The next prime is 221221201039. The reversal of 221221201011 is 110102122122.

It is a cyclic number.

It is not a de Polignac number, because 221221201011 - 2⁷ = 221221200883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221221201511) 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, 5773705 + ... + 5811893.

It is an arithmetic number, because the mean of its divisors is an integer number (18464101200).

Almost surely, 2^221221201011 is an apocalyptic number.

221221201011 is a deficient number, since it is larger than the sum of its proper divisors (74204418189).

221221201011 is a wasteful number, since it uses less digits than its factorization.

221221201011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41178.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221221201011 its reverse (110102122122), we get a palindrome (331323323133).

The spelling of 221221201011 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred one thousand, eleven".