221021010020011 has 4 divisors (see below), whose sum is σ = 221021118210024. Its totient is φ = 221020901830000.

The previous prime is 221021010019813. The next prime is 221021010020059. The reversal of 221021010020011 is 110020010120122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221021010020011 - 2¹¹ = 221021010017963 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221021010019973 and 221021010020000.

It is not an unprimeable number, because it can be changed into a prime (221021010020071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50970505 + ... + 55136506.

It is an arithmetic number, because the mean of its divisors is an integer number (55255279552506).

Almost surely, 2^{221021010020011} is an apocalyptic number.

221021010020011 is a deficient number, since it is larger than the sum of its proper divisors (108190013).

221021010020011 is a wasteful number, since it uses less digits than its factorization.

221021010020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108190012.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221021010020011 its reverse (110020010120122), we get a palindrome (331041020140133).

The spelling of 221021010020011 in words is "two hundred twenty-one trillion, twenty-one billion, ten million, twenty thousand, eleven".