221121020101011 has 32 divisors (see below), whose sum is σ = 317431217571840. Its totient is φ = 136487220240384.

The previous prime is 221121020100989. The next prime is 221121020101019. The reversal of 221121020101011 is 110101020121122.

It is a happy number.

It is not a de Polignac number, because 221121020101011 - 2¹¹ = 221121020098963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221121020101019) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141625635 + ... + 143178428.

It is an arithmetic number, because the mean of its divisors is an integer number (9919725549120).

Almost surely, 2^{221121020101011} is an apocalyptic number.

221121020101011 is a deficient number, since it is larger than the sum of its proper divisors (96310197470829).

221121020101011 is a wasteful number, since it uses less digits than its factorization.

221121020101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284804395.

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

Adding to 221121020101011 its reverse (110101020121122), we get a palindrome (331222040222133).

The spelling of 221121020101011 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, twenty million, one hundred one thousand, eleven".