221101640811 has 12 divisors (see below), whose sum is σ = 322957454040. Its totient is φ = 145744901280.

The previous prime is 221101640803. The next prime is 221101640833. The reversal of 221101640811 is 118046101122.

It is a happy number.

221101640811 is a `hidden beast` number, since 2 + 2 + 1 + 1 + 0 + 1 + 640 + 8 + 11 = 666.

It is not a de Polignac number, because 221101640811 - 2³ = 221101640803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221101640801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138015205 + ... + 138016806.

It is an arithmetic number, because the mean of its divisors is an integer number (26913121170).

Almost surely, 2^221101640811 is an apocalyptic number.

221101640811 is a deficient number, since it is larger than the sum of its proper divisors (101855813229).

221101640811 is a wasteful number, since it uses less digits than its factorization.

221101640811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276032106 (or 276032103 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

Adding to 221101640811 its reverse (118046101122), we get a palindrome (339147741933).

The spelling of 221101640811 in words is "two hundred twenty-one billion, one hundred one million, six hundred forty thousand, eight hundred eleven".