221222112101 has 4 divisors (see below), whose sum is σ = 223707753900. Its totient is φ = 218736470304.

The previous prime is 221222112073. The next prime is 221222112109. The reversal of 221222112101 is 101211222122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 101211222122 = 2 ⋅50605611061.

It can be written as a sum of positive squares in 2 ways, for example, as 13627060225 + 207595051876 = 116735^2 + 455626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221222112101 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 221222112101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222112109) 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, 1242820766 + ... + 1242820943.

It is an arithmetic number, because the mean of its divisors is an integer number (55926938475).

Almost surely, 2^221222112101 is an apocalyptic number.

It is an amenable number.

221222112101 is a deficient number, since it is larger than the sum of its proper divisors (2485641799).

221222112101 is an equidigital number, since it uses as much as digits as its factorization.

221222112101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2485641798.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221222112101 its reverse (101211222122), we get a palindrome (322433334223).

The spelling of 221222112101 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred one".