221211101011 has 16 divisors (see below), whose sum is σ = 233645727744. Its totient is φ = 209025520704.

The previous prime is 221211100993. The next prime is 221211101077. The reversal of 221211101011 is 110101112122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221211101011 - 2²¹ = 221209003859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211100982 and 221211101000.

It is not an unprimeable number, because it can be changed into a prime (221211101711) 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, 518080 + ... + 843106.

It is an arithmetic number, because the mean of its divisors is an integer number (14602857984).

Almost surely, 2^221211101011 is an apocalyptic number.

221211101011 is a deficient number, since it is larger than the sum of its proper divisors (12434626733).

221211101011 is a wasteful number, since it uses less digits than its factorization.

221211101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325410.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221211101011 its reverse (110101112122), we get a palindrome (331312213133).

The spelling of 221211101011 in words is "two hundred twenty-one billion, two hundred eleven million, one hundred one thousand, eleven".