221152601 has 4 divisors (see below), whose sum is σ = 221214132. Its totient is φ = 221091072.

The previous prime is 221152553. The next prime is 221152619. The reversal of 221152601 is 106251122.

221152601 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.

It can be written as a sum of positive squares in 2 ways, for example, as 141586201 + 79566400 = 11899^2 + 8920^2 .

It is a cyclic number.

It is not a de Polignac number, because 221152601 - 2¹⁸ = 220890457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221152621) 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, 25016 + ... + 32681.

It is an arithmetic number, because the mean of its divisors is an integer number (55303533).

Almost surely, 2^221152601 is an apocalyptic number.

It is an amenable number.

221152601 is a deficient number, since it is larger than the sum of its proper divisors (61531).

221152601 is an equidigital number, since it uses as much as digits as its factorization.

221152601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61530.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 221152601 is about 14871.2003886707. The cubic root of 221152601 is about 604.7334855083.

The spelling of 221152601 in words is "two hundred twenty-one million, one hundred fifty-two thousand, six hundred one".