221020011210111 has 32 divisors (see below), whose sum is σ = 295493026664448. Its totient is φ = 146947385537280.

The previous prime is 221020011210077. The next prime is 221020011210113. The reversal of 221020011210111 is 111012110020122.

It is a happy number.

It is not a de Polignac number, because 221020011210111 - 2¹¹ = 221020011208063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221020011210113) 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 31 ways as a sum of consecutive naturals, for example, 8895226890 + ... + 8895251736.

It is an arithmetic number, because the mean of its divisors is an integer number (9234157083264).

Almost surely, 2^{221020011210111} is an apocalyptic number.

221020011210111 is a deficient number, since it is larger than the sum of its proper divisors (74473015454337).

221020011210111 is a wasteful number, since it uses less digits than its factorization.

221020011210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30071.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221020011210111 its reverse (111012110020122), we get a palindrome (332032121230233).

The spelling of 221020011210111 in words is "two hundred twenty-one trillion, twenty billion, eleven million, two hundred ten thousand, one hundred eleven".