221707101 has 32 divisors (see below), whose sum is σ = 373248000. Its totient is φ = 113705280.

The previous prime is 221707093. The next prime is 221707127. The reversal of 221707101 is 101707122.

It is a happy number.

It is not a de Polignac number, because 221707101 - 2³ = 221707093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221707141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12175 + ... + 24323.

It is an arithmetic number, because the mean of its divisors is an integer number (11664000).

Almost surely, 2^221707101 is an apocalyptic number.

221707101 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221707101 is a deficient number, since it is larger than the sum of its proper divisors (151540899).

221707101 is a wasteful number, since it uses less digits than its factorization.

221707101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12249.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 221707101 is about 14889.8321347153. The cubic root of 221707101 is about 605.2384834911.

Adding to 221707101 its sum of digits (21), we get a palindrome (221707122).

The spelling of 221707101 in words is "two hundred twenty-one million, seven hundred seven thousand, one hundred one".