221011102021 has 4 divisors (see below), whose sum is σ = 221239656352. Its totient is φ = 220782547692.

The previous prime is 221011102009. The next prime is 221011102043. The reversal of 221011102021 is 120201110122.

221011102021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 221011102021 - 2⁵ = 221011101989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221011101992 and 221011102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221011102061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114275715 + ... + 114277648.

It is an arithmetic number, because the mean of its divisors is an integer number (55309914088).

Almost surely, 2^221011102021 is an apocalyptic number.

It is an amenable number.

221011102021 is a deficient number, since it is larger than the sum of its proper divisors (228554331).

221011102021 is an equidigital number, since it uses as much as digits as its factorization.

221011102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228554330.

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

Adding to 221011102021 its reverse (120201110122), we get a palindrome (341212212143).

The spelling of 221011102021 in words is "two hundred twenty-one billion, eleven million, one hundred two thousand, twenty-one".