221713801 has 4 divisors (see below), whose sum is σ = 222195204. Its totient is φ = 221232400.

The previous prime is 221713763. The next prime is 221713837. The reversal of 221713801 is 108317122.

It is a happy number.

221713801 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 108317122 = 2 ⋅54158561.

It can be written as a sum of positive squares in 2 ways, for example, as 119683600 + 102030201 = 10940^2 + 10101^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221713801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221713861) 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, 240010 + ... + 240931.

It is an arithmetic number, because the mean of its divisors is an integer number (55548801).

Almost surely, 2^221713801 is an apocalyptic number.

It is an amenable number.

221713801 is a deficient number, since it is larger than the sum of its proper divisors (481403).

221713801 is an equidigital number, since it uses as much as digits as its factorization.

221713801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481402.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 221713801 is about 14890.0571187622. The cubic root of 221713801 is about 605.2445802090.

The spelling of 221713801 in words is "two hundred twenty-one million, seven hundred thirteen thousand, eight hundred one".