221123523101 has 8 divisors (see below), whose sum is σ = 243941148024. Its totient is φ = 199135630080.

The previous prime is 221123523077. The next prime is 221123523119. The reversal of 221123523101 is 101325321122.

It can be written as a sum of positive squares in 4 ways, for example, as 18632523001 + 202491000100 = 136501^2 + 449990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221123523101 is a prime.

It is a super-2 number, since 2×221123523101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221123523121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207432416 + ... + 207433481.

It is an arithmetic number, because the mean of its divisors is an integer number (30492643503).

Almost surely, 2^221123523101 is an apocalyptic number.

It is an amenable number.

221123523101 is a deficient number, since it is larger than the sum of its proper divisors (22817624923).

221123523101 is a wasteful number, since it uses less digits than its factorization.

221123523101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414865951.

The product of its (nonzero) digits is 720, while the sum is 23.

Adding to 221123523101 its reverse (101325321122), we get a palindrome (322448844223).

The spelling of 221123523101 in words is "two hundred twenty-one billion, one hundred twenty-three million, five hundred twenty-three thousand, one hundred one".