221012101 has 4 divisors (see below), whose sum is σ = 221216512. Its totient is φ = 220807692.

The previous prime is 221012081. The next prime is 221012111. The reversal of 221012101 is 101210122.

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 221012101 - 2⁵ = 221012069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100575 + ... + 102748.

It is an arithmetic number, because the mean of its divisors is an integer number (55304128).

Almost surely, 2^221012101 is an apocalyptic number.

It is an amenable number.

221012101 is a deficient number, since it is larger than the sum of its proper divisors (204411).

221012101 is a wasteful number, since it uses less digits than its factorization.

221012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204410.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221012101 is about 14866.4757424213. The cubic root of 221012101 is about 604.6053943868.

Adding to 221012101 its reverse (101210122), we get a palindrome (322222223).

It can be divided in two parts, 22 and 1012101, that multiplied together give a palindrome (22266222).

The spelling of 221012101 in words is "two hundred twenty-one million, twelve thousand, one hundred one".