221201001101 has 4 divisors (see below), whose sum is σ = 221203292604. Its totient is φ = 221198709600.

The previous prime is 221201001089. The next prime is 221201001103. The reversal of 221201001101 is 101100102122.

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 118305042025 + 102895959076 = 343955^2 + 320774^2 .

It is a cyclic number.

It is not a de Polignac number, because 221201001101 - 2²² = 221196806797 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 (221201001103) 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, 994280 + ... + 1196241.

It is an arithmetic number, because the mean of its divisors is an integer number (55300823151).

Almost surely, 2^221201001101 is an apocalyptic number.

It is an amenable number.

221201001101 is a deficient number, since it is larger than the sum of its proper divisors (2291503).

221201001101 is a wasteful number, since it uses less digits than its factorization.

221201001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2291502.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 221201001101 its reverse (101100102122), we get a palindrome (322301103223).

The spelling of 221201001101 in words is "two hundred twenty-one billion, two hundred one million, one thousand, one hundred one".