221125655 has 8 divisors (see below), whose sum is σ = 266053200. Its totient is φ = 176432256.

The previous prime is 221125643. The next prime is 221125673. The reversal of 221125655 is 556521122.

221125655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 221125655 - 2¹⁴ = 221109271 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56450 + ... + 60239.

It is an arithmetic number, because the mean of its divisors is an integer number (33256650).

Almost surely, 2^221125655 is an apocalyptic number.

221125655 is a deficient number, since it is larger than the sum of its proper divisors (44927545).

221125655 is a wasteful number, since it uses less digits than its factorization.

221125655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117073.

The product of its digits is 6000, while the sum is 29.

The square root of 221125655 is about 14870.2943817532. The cubic root of 221125655 is about 604.7089235689.

Adding to 221125655 its reverse (556521122), we get a palindrome (777646777).

The spelling of 221125655 in words is "two hundred twenty-one million, one hundred twenty-five thousand, six hundred fifty-five".