221020121222011 has 8 divisors (see below), whose sum is σ = 224319852555344. Its totient is φ = 217720417052160.

The previous prime is 221020121221973. The next prime is 221020121222027. The reversal of 221020121222011 is 110222121020122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221020121222011 - 2²⁷ = 221019987004283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221020121222011.

It is not an unprimeable number, because it can be changed into a prime (221020121222051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9908191 + ... + 23242471.

It is an arithmetic number, because the mean of its divisors is an integer number (28039981569418).

Almost surely, 2^{221020121222011} is an apocalyptic number.

221020121222011 is a deficient number, since it is larger than the sum of its proper divisors (3299731333333).

221020121222011 is a wasteful number, since it uses less digits than its factorization.

221020121222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13581741.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221020121222011 its reverse (110222121020122), we get a palindrome (331242242242133).

The spelling of 221020121222011 in words is "two hundred twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, eleven".