2221020101 has 4 divisors (see below), whose sum is σ = 2221114572. Its totient is φ = 2220925632.

The previous prime is 2221020077. The next prime is 2221020119. The reversal of 2221020101 is 1010201222.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1010201222 = 2 ⋅505100611.

It can be written as a sum of positive squares in 2 ways, for example, as 1174432900 + 1046587201 = 34270^2 + 32351^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221020101 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 (2221020121) 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, 18845 + ... + 69261.

It is an arithmetic number, because the mean of its divisors is an integer number (555278643).

Almost surely, 2^2221020101 is an apocalyptic number.

It is an amenable number.

2221020101 is a deficient number, since it is larger than the sum of its proper divisors (94471).

2221020101 is an equidigital number, since it uses as much as digits as its factorization.

2221020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94470.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2221020101 is about 47127.6999332664. The cubic root of 2221020101 is about 1304.7205306730.

Adding to 2221020101 its reverse (1010201222), we get a palindrome (3231221323).

The spelling of 2221020101 in words is "two billion, two hundred twenty-one million, twenty thousand, one hundred one".