221101101097 has 4 divisors (see below), whose sum is σ = 221157551556. Its totient is φ = 221044650640.

The previous prime is 221101101077. The next prime is 221101101101. The reversal of 221101101097 is 790101101122.

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 83278993561 + 137822107536 = 288581^2 + 371244^2 .

It is a cyclic number.

It is not a de Polignac number, because 221101101097 - 2³⁵ = 186741362729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221101101037) 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, 28219354 + ... + 28227187.

It is an arithmetic number, because the mean of its divisors is an integer number (55289387889).

Almost surely, 2^221101101097 is an apocalyptic number.

It is an amenable number.

221101101097 is a deficient number, since it is larger than the sum of its proper divisors (56450459).

221101101097 is an equidigital number, since it uses as much as digits as its factorization.

221101101097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56450458.

The product of its (nonzero) digits is 252, while the sum is 25.

Adding to 221101101097 its sum of digits (25), we get a palindrome (221101101122).

The spelling of 221101101097 in words is "two hundred twenty-one billion, one hundred one million, one hundred one thousand, ninety-seven".