101222220221 has 4 divisors (see below), whose sum is σ = 101377231932. Its totient is φ = 101067208512.

The previous prime is 101222220181. The next prime is 101222220283. The reversal of 101222220221 is 122022222101.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122022222101 = 13 ⋅9386324777.

It can be written as a sum of positive squares in 2 ways, for example, as 22718025625 + 78504194596 = 150725^2 + 280186^2 .

It is a cyclic number.

It is not a de Polignac number, because 101222220221 - 2²² = 101218025917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 101222220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101222222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77504876 + ... + 77506181.

It is an arithmetic number, because the mean of its divisors is an integer number (25344307983).

Almost surely, 2^101222220221 is an apocalyptic number.

It is an amenable number.

101222220221 is a deficient number, since it is larger than the sum of its proper divisors (155011711).

101222220221 is an equidigital number, since it uses as much as digits as its factorization.

101222220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155011710.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 101222220221 its reverse (122022222101), we get a palindrome (223244442322).

The spelling of 101222220221 in words is "one hundred one billion, two hundred twenty-two million, two hundred twenty thousand, two hundred twenty-one".