221021201101 has 4 divisors (see below), whose sum is σ = 221613751612. Its totient is φ = 220428650592.

The previous prime is 221021201059. The next prime is 221021201111. The reversal of 221021201101 is 101102120122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 189463455076 + 31557746025 = 435274^2 + 177645^2 .

It is a cyclic number.

It is not a de Polignac number, because 221021201101 - 2⁷ = 221021200973 is a prime.

It is a super-2 number, since 2×221021201101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021201111) 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 3 ways as a sum of consecutive naturals, for example, 296274696 + ... + 296275441.

It is an arithmetic number, because the mean of its divisors is an integer number (55403437903).

Almost surely, 2^221021201101 is an apocalyptic number.

It is an amenable number.

221021201101 is a deficient number, since it is larger than the sum of its proper divisors (592550511).

221021201101 is an equidigital number, since it uses as much as digits as its factorization.

221021201101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592550510.

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

Adding to 221021201101 its reverse (101102120122), we get a palindrome (322123321223).

The spelling of 221021201101 in words is "two hundred twenty-one billion, twenty-one million, two hundred one thousand, one hundred one".