221671701 has 8 divisors (see below), whose sum is σ = 328402560. Its totient is φ = 147781116.

The previous prime is 221671691. The next prime is 221671717. The reversal of 221671701 is 107176122.

221671701 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221671701 - 2¹³ = 221663509 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8210063 = 221671701 / (2 + 2 + 1 + 6 + 7 + 1 + 7 + 0 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221671741) 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, 4105005 + ... + 4105058.

It is an arithmetic number, because the mean of its divisors is an integer number (41050320).

Almost surely, 2^221671701 is an apocalyptic number.

It is an amenable number.

221671701 is a deficient number, since it is larger than the sum of its proper divisors (106730859).

221671701 is an equidigital number, since it uses as much as digits as its factorization.

221671701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8210072 (or 8210066 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 221671701 is about 14888.6433565990. The cubic root of 221671701 is about 605.2062689421.

The spelling of 221671701 in words is "two hundred twenty-one million, six hundred seventy-one thousand, seven hundred one".